Web3 is a new vision of the internet. It takes us away from today’s centralized internet, where data is stored in servers managed by trusted counterparties like Facebook and Google, to a decentralized internet, where a trustless network of peer-to-peer servers manages and verifies data.
Web2 (early 2000s-today) is read and write. People create and consume content on the social platforms that we're all familiar with. In web2, tech giants extract value from users by sitting in the middle. Web2 is built on client-server architecture where users are the client, and companies control the servers.