DID stands for Decentralized Identifier. It is a type of identifier that enables self-sovereign digital identity on the internet. Unlike traditional identifiers such as usernames or email addresses, which are often controlled by centralized authorities, DIDs are designed to be decentralized, cryptographically verifiable, and under the control of the individual user.

Here are some key characteristics of DIDs:

1. Decentralization: DIDs are not tied to any centralized authority or organization. Instead, they are created and managed by the individual user or entity, allowing for greater autonomy and control over digital identity.
2. Cryptographic Security: DIDs are cryptographically secured, meaning that they are backed by public-key cryptography. Each DID is associated with a unique public-private key pair, with the private key held securely by the owner. This ensures that only the owner can prove ownership and control of the DID.
3. Interoperability: DIDs are designed to be interoperable across different platforms, protocols, and applications. They adhere to standardized formats and protocols defined by organizations such as the World Wide Web Consortium (W3C), enabling seamless integration and portability of digital identities across the internet.
4. Verifiability: DIDs enable verifiable digital identities, allowing users to prove ownership and authenticity of their identities without relying on third-party intermediaries. This is achieved through the use of cryptographic proofs and digital signatures, which can be independently verified by others.
5. Privacy and Control: DIDs empower individuals with greater privacy and control over their digital identities and personal information. Users can selectively disclose information about themselves and control access to their identity attributes, reducing the risk of data breaches and identity theft.

Overall, DIDs are a foundational component of self-sovereign identity systems, providing individuals with secure, portable, and privacy-enhancing digital identities on the internet. They hold the promise of revolutionizing how identity is managed and verified online, enabling greater trust, security, and interoperability in the digital realm.