In 1994, Netscape Communications invented SSL. SSL (Secure Socket Layer) protocol is used for secure communication between browser and server. For E-mail server privacy is maintained with the help of secured protocol. SSL certificate is issued by SSL CA (Certifying Authority). HTTPS protocol is used for the SSL website and on left side of the address some indicator is always there after verification.
TLS (Transport Layer Security) is the successor of the SSL.TLS 1.0 was defined in RFC 2246 in 1999.