Emerging Tech Glossary: Metaverse, Web3, Digital Twin, NFT

1.1 What does the word mean?

The metaverse is a network of 3D virtual worlds that people enter through screens or headsets. That plain gloss is our own. An avatar is the character a user plays inside such a world. That gloss is also our own.

No single definition is settled. The World Economic Forum (WEF) said in January 2023 that a standard definition is still under development.

1.2 Which definitions should you know?

• Matthew Ball, quoted by WEF: a massively scaled and interoperable network of real-time rendered 3D virtual worlds. WEF’s quote adds that it can be experienced by an effectively unlimited number of users.
• Gartner, 2022: a persistent and immersive digital environment of independent, yet interconnected networks. Gartner is a technology research firm. It says these networks will use protocols that are yet to be determined.

Interoperable means different systems can work together. Persistent means the world carries on when you log out. Both glosses are our own.

1.3 How does ownership fit in?

The UPSC 2024 question described a network of 3D virtual worlds where users can exert property rights over virtual items. WEF lists asset ownership among the topics that technical interoperability design should address.

So ownership of virtual items is part of how the term is described. That is why NFTs come up later in this lesson.

1.4 Is a headset the same as the metaverse?

No. A headset is only a device for entering virtual spaces. The definitions above describe a network of worlds, not hardware. That reading of the definitions is our own.

2.1 How do official and company sources describe it?

A Lok Sabha reply of 29 March 2023, published by PIB, said Web3 refers to the next generation of the internet. It described Web3 as characterized by decentralized technology and increased user control over data and privacy.

AWS, a cloud company, calls Web3 an umbrella term. It means tools like blockchain that spread data ownership and control across the internet.

Decentralized means spread across many computers, not held by one company. That gloss is our own. A blockchain is a shared digital ledger, or record book, kept on many computers. This gloss is ours too. Our lesson on Blockchain Technology covers it in full.

2.2 How is Web3 different from Web1 and Web2?

ethereum.org splits the web’s short history into loose periods. It then quotes a 2020 post that sums up the idea.

• Web1 (about 1990 to 2004): read-only, with mostly static websites owned by companies.
• Web2 (2004 to now): read-write. Social media began in 2004, and users could create content.
• Web3: read-write-own. The post says Web1 was read-only, Web2 is read-write, and Web3 will be read-write-own.

The word own is the point. Users would hold a stake in what they use. That reading is our own.

2.3 Who coined the term, and when?

WIRED reports that Gavin Wood coined the term Web3 (originally Web 3.0) in 2014. At the time he was fresh off of helping develop Ethereum.

ethereum.org words it a little differently. It says Wood coined the premise shortly after Ethereum launched in 2014. Both sources give 2014.

2.4 How does Web3 link to the metaverse?

Meta said in a December 2022 policy paper that two things matter most for a metaverse economy. They are interoperability and portability. Meta said both will be powered by further adoption of web3 technologies.

Portability means moving your items from one platform to another. That gloss is our own. Meta’s statement is one company’s view, not a settled fact.

3.1 What is the plain meaning?

IBM defines a digital twin as a virtual representation of a physical object or system. It uses real-time data to accurately reflect its real-world counterpart’s behavior, performance and conditions.

IBM says digital twins can model jet engines, locomotive engines and electricity-generating turbines. Picture a jet engine fitted with sensors. Its readings flow into a computer copy that behaves like the engine. That picture is our own.

NIST calls a digital twin a particular type of computer model of a physical system, such as a machine or building.

A 2012 NASA paper calls it an integrated multiphysics, multiscale, probabilistic simulation of an as-built vehicle or system. It uses sensor updates and fleet history to mirror the life of its corresponding flying twin.

3.2 How is a twin different from a 3D model or a simulation?

• 3D model: IBM calls it a static representation of an object at a single point in time. It shows what the object looks like, not how it behaves.
• Simulation: IBM says simulations are static. They run predefined scenarios and have no built-in way to send findings to a physical system.
• Digital twin: IBM says a key feature is real-time, two-way data exchange between the object and its virtual replica.

3.3 Where did the idea come from?

• 1960s: NASA built physical replicas of its spacecraft to study how they might respond to different conditions (IBM).
• 1970: after an onboard explosion on Apollo 13, NASA relied on these models to explore rescue scenarios. IBM notes they were physical copies, not virtual ones.
• 2002: a NASA slide says Michael Grieves and colleagues introduced the Digital Twin concept at a Society of Manufacturing Engineers conference.
• 2010: the same slide says John Vickers introduced the Digital Twin to NASA in a 2010 Technology Roadmap. IBM says he officially coined the term there.

Our own reading is that 2010 marks the term in a NASA roadmap. It does not mark the first use of replicas.

4.1 What does the name mean?

NFT stands for non-fungible token. ethereum.org says NFTs are tokens that are individually unique. IBM says NFTs solve the issue of uniqueness and a one-of-a-kind asset type.

IBM also calls NFTs tokens that are simple proof-validations of the existence, authenticity and ownership of digital assets. A token is a digital marker recorded on a blockchain. That gloss is our own.

4.2 What does fungible mean?

IBM says an asset is fungible when it is mutually interchangeable with another identical item. Think of one rupee note and another. You do not mind which one you get. That example is our own.

The table covers only what the two sources say about the words. It does not rank the two kinds.

4.3 Does every NFT have to be one of a kind?

Not quite. ethereum.org says the creator of an NFT can decide how many replicas exist. It gives 5000 General Admission tickets as an example of exact replicas.

Each NFT still has its own ID. So the word unique describes the token, not the number of copies a creator may make. That reading is our own.

4.4 How is an NFT made?

ethereum.org says an NFT is created through a smart contract. A smart contract is a program stored on a blockchain. That gloss is our own.

• The contract gives each NFT a number that makes it unique.
• Usually some information (metadata) is attached, describing what the NFT represents.
• When someone creates or “mints” an NFT, they tell the smart contract to give them ownership of it.

ethereum.org adds that creators can program royalties directly into the NFT contract.

4.5 How do NFTs link to the metaverse?

Meta said in December 2022 that non-financial blockchain-based assets, like NFTs, are well positioned to establish ownership of digital objects in the metaverse. The words “well positioned” express a view. They are not a guarantee.

5.1 Where does each term fit?

Our own summary is this. The metaverse is the destination: a network of 3D worlds. Web3 and NFTs are proposed ways to handle portability and ownership there. Digital twins are one of the technologies it draws on.

The sources behind each link are specific. Meta ties portability to web3 and ownership to NFTs. WEF says the metaverse creates immersive experiences enabled by a range of technologies. It names extended reality, artificial intelligence, the internet of things and digital twins.

5.2 Does any one term need the others?

Not by definition. The sources define each term separately. IBM’s digital twin examples include engines and turbines, with no metaverse or NFT involved. That reading is our own.

6.1 Which industries does IBM name?

• Power generation: models of jet engines, locomotive engines and electricity-generating turbines.
• Automotive: IBM says digital twins are used extensively in auto design.
• Urban planning: civil engineers use twins to simulate how pedestrians and vehicles move through cities. IBM adds that twins play a key role in smart cities.

NIST adds a factory view. It says product design, factory optimization and machinery settings all affect costs that digital twins can potentially reduce.

6.2 What has Industry 4.0 got to do with it?

IBM says enterprises can connect multiple digital twins to model more complex systems. It names a larger digital transformation or Industry 4.0 strategy as one purpose.

6.3 Is India using digital twins?

Three official documents mention them. Each is an invitation or a plan, so do not call them finished systems.

• DoT, 15 February 2024: PIB reported the ‘Sangam: Digital Twin’ initiative. It is a proof of concept in two stages in one of India’s major cities.
• ISRO, 16 March 2023: an Expression of Interest listed item TDI077, Digital Twins, for NRSC. Its aim was a new geospatial framework to transfer real-time data to create functional digital twins.
• VSSC, 16 May 2025: an advertisement sought a Project Life Cycle Management Platform for a launch vehicle project. It said a digital twin framework will allow dynamic mapping of data to virtual models.

7.1 What did MeitY and Meta launch in 2022?

PIB reported on 13 September 2022 that MeitY Startup Hub and Meta launched an XR Startup Program. XR means extended reality, which includes AR and VR.

PIB said the program focuses on skilling and building technological capabilities for the metaverse. The accelerator will support 40 early-stage start-ups in XR with a grant of Rs 20 lakhs each.

7.2 What did the Government say about Web3 in 2023?

The Union Minister of State for Commerce and Industry, Shri Som Parkash, gave a written Lok Sabha reply on 29 March 2023. It called the Web3 sector relatively new and still evolving.

It also said there was no specific regulation for Web3 apart from two laws. These were the Information Technology Act 2008 and the Information Technology Rules 2022 on intermediaries and digital media ethics. That is a snapshot of March 2023. Check for newer notices before quoting it as current.

7.3 What is the Blockchain India Challenge?

MeitY launched the Blockchain India Challenge on Monday, 23 February 2026, at MeitY, New Delhi. Secretary Shri S. Krishnan launched it.

The page’s title says the challenge promotes blockchain-based digital governance solutions. MeitY and C-DAC officials were present, along with various government departments and startups.

8.1 How did the Budget tax virtual digital assets?

Budget Speech 2022-23, paragraph 131, introduced a specific tax regime. PIB’s Budget highlights repeat the same lines.

• Income from transfer of any virtual digital asset (VDA) is taxed at 30 per cent.
• No deduction is allowed except the cost of acquisition.
• Loss from transfer of a VDA cannot be set off against any other income.
• TDS is provided at 1 per cent of the consideration above a monetary threshold.
• A gift of a VDA is taxed in the hands of the recipient.

8.2 Do NFTs count as virtual digital assets?

The Finance Bill 2022, as introduced, inserted a new clause 47A into the Income-tax Act. Its list of virtual digital assets includes a non-fungible token or any other token of similar nature, by whatever name called.

An Explanation in the Bill defines a non-fungible token. It is any digital asset the Central Government names by notification. The Memorandum to the Bill also says NFTs and similar tokens are included in the definition.

8.3 Are NFTs regulated, or treated as currency?

Rajya Sabha Unstarred Question 556 was answered on 7 February 2023 by Shri Pankaj Chaudhary, Minister of State in the Finance Ministry. The reply said crypto assets, including NFTs, are unregulated in India. It also said the Government does not consider NFTs as a currency.

That is a snapshot of February 2023. A tax rule and a regulation are different things. Our own reading is that being taxed does not by itself mean an asset is regulated.

8.4 What about anti-money-laundering rules?

A Finance Ministry notification, S.O. 1072(E), is dated 7 March 2023. It covers swapping virtual digital assets for fiat currency. It also covers moving them and keeping them safe.

PIB reported on 28 December 2023 that VDA service providers were brought into the AML-CFT framework in March 2023. This was under the Prevention of Money Laundering Act, 2002.

9.1 Is a complete metaverse here yet?

Gartner said in 2022 that a complete metaverse will take at least eight years to develop. It said the solutions then positioned as metaverse do not meet the full definition.

Early solutions may have some of these traits, but not all. The traits are persistence, decentralization, collaboration and interoperability. Gartner also warned that if the field stays fragmented, with siloed experiences, a complete metaverse will never be achievable.

This is a 2022 view. Check newer research before treating it as current.

9.2 Is Web3 the same as cryptocurrency?

The definitions in this lesson do not name any single coin. PIB speaks of decentralized technology. AWS calls Web3 an umbrella term for technologies like blockchain. ethereum.org says it is challenging to provide a rigid definition.

So treat Web3 as a family of ideas, not as one product. That reading is our own.

9.3 What limits does ethereum.org admit?

• Cost: the relative cost of transactions is still prohibitive to many.
• User experience: the technical barrier to entry is currently too high.
• Education: Web3 introduces new paradigms that need different mental models than Web2.0.

10.1 What has UPSC asked?

10.2 Which mix-ups does this topic invite?

• Read-only: that word belongs to Web1. Web3 is described as read-write-own.
• 3D model or simulation: IBM calls both static. A digital twin uses real-time, two-way data.
• 2002 and 2010: Grieves introduced the concept in 2002. Vickers introduced it to NASA in 2010.
• Taxed or regulated: VDA transfers face a 30 per cent tax. In February 2023 the Government said NFTs are unregulated and not a currency.
• Dated views: Gartner’s eight years and the Web3 reply of March 2023 are snapshots, not current facts.

10.3 Quick Q&A