In traditional web, or Web2.0, as we know, if you want to access a file on a network, you have to retrieve it from a central server. IPFS (InterPlanetary File System) is quite different from that as it’s decentralized. Think of it as the HyperText Transfer Protocol (HTTP) or FTP (File Transfer Protocol) for Web3:
https://freename.io/what-is-ipfs/