Three Network Protocols and More!

FTP
The File Transfer Protocol (FTP) is a standard network protocol
used to transfer computer files between a client and server on a
computer network. FTP is built on a client-server model
architecture and uses separate control and data connections
between the client and the server.
POP3
Post Office Protocol (POP) is an application-layer
Internet standard protocol used by local e-mail clients to
retrieve e-mail from a remote server over a TCP/IP connection.
HTTP
The Hypertext Transfer Protocol (HTTP)
is an application protocol for distributed,
collaborative, hypermedia information systems.

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and others by clicking the link below!

Wikipedia