D

Term	What is it?
Decentralized Identifier (DID)	A DID is a type of identifier that enables verifiable, decentralized digital identity. A DID is unique and may refer to any subject (e.g. a person, organization, thing, data model, abstract entity). It is a simple text string consisting of three parts: 1) the did URI scheme identifier, 2) the identifier for the DID method, and 3) the DID method-specific identifier. An example of a DID is did:ethr:123454123412341236abcdef. DIDs and DID documents are managed via verifiable data registries.
Dive deeper - W3C DID
DID Document	This is the cryptographic metadata associated with a specific DID, such as the public key information or service endpoints. This record is accessible using a DID resolver.
Dive deeper - W3C DID Resolution
DID Method	This is a mechanism by which a particular type of DID and its associated DID document are created, resolved, updated, and deactivated. DID methods are defined using DID method specifications.
Dive Deeper - W3C DID Method Specifications
Digital Product Passport (DPP)	A Digital Product Passport serves as a central hub for accessing product and supply chain information. It is a digital representations of a product, containing essential information about its lifecycle, attributes, and compliance with standards. Product passports enable transparency and traceability across the supply chain, allowing stakeholders to access and verify product information easily.
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Digital Twin	A digital twin is a digital representation of any entity.

Clarifying 'digital representation': In our case, the digital representation is a unique identifier (UID), akin to a fingerprint, making an object uniquely identifiable.
Clarifying 'entity': It can refer to things such as a machine, a product, a software, or even living organisms like humans. | | Digital Wallet | A physical wallet stores your IDs like drivers' licenses, credit cards, and other credentials. In a similar sense, a digital wallet is a piece of software that allows you to securely acquire, store, manage and check Verifiable Credentials (VCs) as well as Decentralized Identifiers (DIDs). The wallet is not just a storage facility but also permits the use of VCs. This means that the wallet enables you to access certain services or exchange information. |

V

Term	What is it?
Verifiable Credential (VC)	Credentials are sets of claims that identify a particular entity or verify a specific attribute or qualifications such as driver's license, enterprise ID, and university degrees. W3C Verifiable Credentials provide a mechanism to express these sorts of credentials on the web in a cryptographically secure, privacy-respecting, and machine-verifiable way.
Dive Deeper - W3C VC Use Cases