W3C VC
W3C VC is the Verifiable Credentials Data Model, the World Wide Web Consortium's open standard for how a verifiable credential is structured: which claims it carries, who issued it, about whom, and how its cryptographic proof is attached.
The data model is deliberately format-agnostic. It fixes the shape of a credential, meaning the issuer, the subject, the claims, the validity period and the status information, while leaving the choice of proof mechanism open, so the same credential can be secured with a Data Integrity proof or enveloped in a JOSE or COSE signature. That separation is what lets a wallet built for one ecosystem read a credential issued in another: the meaning of the data does not change when the signature format does. It is the vocabulary most other specifications in this space build on, including the presentation and issuance protocols a wallet actually speaks.