Funding of information sources starting to be commercial, via subscription or advertisements. Application programs to provide or use services also use these protocols. Because multiple protocols can be used at the same time on the net, it's like having many networks in one. Analogous to having voice, data, and fax all on telephone network . Might be a client or a server or both.
Last part is domain.
Name server nodes change the DNS name into an IP address. File Transfer Protocol. This is about the only way to obtain software via the net. Sort of like a bulletin board. Not as fast as email.