"“Web3” is an undefined marketing buzzword. It means whatever the advocate in question needs it to mean in that sentence." As far as I know, Web3 is defined as

"“Web3” is an undefined marketing buzzword. It means whatever the advocate in question needs it to mean in that sentence." As far as I know, Web3 is defined as all technologies that try to decentralize the Web. Your frontend code stays almost the same. It just gets delivered via IPFS, or Arweave. You still call APIs, they just happen to be gateways to (potentially/actually) decentralized technology.