Web 3.0 is a new generation of the Internet that seeks to create a decentralized environment for web applications. This change is important because it changes the way websites and applications interact with data and users. If you want to know
what is a web3 website, I recommend visiting
https://romtos.com/articles/what-is-web-3 . They provide great articles on what Web 3.0 is and how it affects websites. You'll find lots of examples and explanations there.