Difference between SSL(Secure Sockets Layer) and TLS(Transport Layer Security)

1) Open version of SSL is referred to as the TLS protocol. So TLS is a open protocol while SSL is not.

2) To use SSL with a particular protocol(say, HTTP), it is necessary to have a different port no.(for https, 443) for communication. This is done in order to avoid affecting other clients who communicate on the default clear-channel port(80). So we have port 80 reserved for HTTP and port 443 for SSL over HTTP. Managing multiple requests under both SSL and clear channel may become complex. 

    TLS, however, allows to access both types of traffic(secure and non-secure) over the same default port. No separate port is needed while using TLS.