1/ .icp is not a top-level domain, so you cannot really use https://dfinity.icp to access dfinity.org
2/ now with .host feature of ICNS, if you set the Host record of dfinity.icp to dfinity.org, you can use dfinity.icp.host to access dfinity.org, .host feature helps bridge the traditional Web2 DNS system with Web3 ICNS system
1/ ICNS stands for Internet Computer Name Service, it essentially maps human-readable names to your crypto addresses and other custom user metadata. We believe a good name service is the fundamental component of the Web3 ecosystem
2/ it is built on the IC, the one and only truly web3 native platform, integrated with @plug_wallet, @dank_ois & @sonic_ooo's WICP for payment, @cap_ois for history tx storage, it is a demonstration of the capability of IC and the interoperability of open internet services