HTTPS
Hyper text transfer protocol secure. Secure version of HTTP, often used for financial transactions.
SMTP
Simple mail transfer protocol. Handles email communication.
FTP
File transfer protocol. Governs the transfer of files across the internet.
VoIP
Voice over internet protocol. Handles audio/visual communication.
SSL
Secure Socket layer. It uses asymmetric encryption to create a secure link between one computer and another. A user can transfer securely data such as credit card number.
Uses of SSL
TLS
Transport layer security. Work the same way as SSL, but is more secure as many security issues that arose with SSL were fixed with the development of TLS.