Decentralized digital identity refers to a system in which an individual's identity information is stored and managed independently, without relying on a central authority or intermediary. In this system, the individual has control over their own identity information and can choose how and when to share it with others.

This is often achieved through the use of blockchain technology, which allows for secure and transparent storage of data. Decentralized digital identity systems typically use cryptographic techniques to ensure that the data is tamper-proof and that only authorized parties can access it.

The advantages of a decentralized digital identity system include increased privacy and security, as well as greater control and ownership over personal data. It also allows for easier and more efficient sharing of information across different platforms and services, as the individual can provide their identity information to multiple parties without having to go through a centralized verification process each time.