Blockchain is a decentralized digital ledger that maintains a continuously growing list of records, called blocks, which are secured and linked together using cryptography. It was originally developed for the cryptocurrency Bitcoin, but now it has many applications beyond digital currency. Blockchain technology enables secure, transparent, and tamper-proof record-keeping, without the need for a centralized authority.

Web 3.0, also known as the decentralized web or the semantic web, is the next evolution of the internet. It is a vision of the internet where information and data are decentralized and users have more control over their personal data. Web 3.0 aims to create a more open, collaborative, and secure web where applications and services can interact with each other seamlessly. Blockchain is one of the key technologies that underpins the Web 3.0 vision, providing a secure and decentralized way to store and transfer data and value.