Ref : http://security.stackexchange.com/questions/5126/whats-the-difference-between-ssl-tls-and-https
TLS is the new name for SSL. Namely, SSL protocol got to version 3.0; TLS 1.0 is "SSL 3.1". TLS versions currently defined include TLS 1.1 and 1.2. Each new version adds a few features and modifies some internal details. We sometimes say "SSL/TLS".
HTTPS is HTTP-within-SSL/TLS. SSL (TLS) establishes a secured bidirectional tunnel for arbitrary binary data between two hosts. HTTP is a protocol for sending requests and receiving answers, each request and answer consisting in detailed headers and (possibly) some content. HTTP is meant to run over a bidirectional tunnel for arbitrary binary data; when that tunnel is a SSL/TLS connection, then the whole is called "HTTPS".
- SSL= Secure Sockets Layer
- TLS = Transport Layer Security
- HTTPS = HyperText Transfer Protocol Secured
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