As well as being supported by local e-mail clients POP3 is also supported by most webmail services such as Hotmail, Gmail and Yahoo! Mail.
POP3 is just one communications protocol on the web. Others include:
- Transmission Control Protocol (TCP) tcp
- User Datagram Protocol (UDP) udp
- Internet Control Message Protocol (ICMP) icmp
- Hypertext Transfer Protocol (HTTP) http
- File Transfer Protocol (FTP) ftp
- Internet Message Access Protocol (IMAP) imap