Post Office Protocol version 3, known as POP3, is an Internet standard protocol for storing and retrieving messages from Simple Mail Transfer Protocol (SMTP) hosts.
Simple Mail Transfer Protocol is a standard application-layer protocol for delivery of e-mail over a TCP/IP internetwork such as the Internet.
FTP stands for File Transfer Protocol is an Internet standard application-level TCP/IP protocol that can be used for transferring files between hosts on a TCP/IP internetwork.
Internet Protocol, or just IP, is a TCP/IP network layer protocol for addressing and routing packets of data between hosts on a TCP/IP network.
Hypertext Transfer Protocol is a standard Internet protocol that specifies the client/server interaction processes between Web browsers such as Microsoft Internet Explorer or Chrome and Web servers...
Internet Cache Protocol is a UDP-based protocol developed in 1995 to allow arrays of proxy servers to communicate and work together over a network.