What is the difference between TLS and SSL?

The Transport Layer Security (TLS) is considered significantly more secure than the Secure Socket Layer (SSL).

Explanation: The cryptographic transport algorithm considered to be significantly more secure than SSL (Secure Socket Layer) is TLS (Transport Layer Security). TLS, like SSL, is a protocol that encrypts and delivers mail securely, both for incoming (IMAP protocol) and for outgoing mail (SMTP protocol). However, TLS is an updated, more secure, version of SSL. We could say that SSL is older than TLS. SSL is now considered obsolete and insecure, even if configured correctly and fully updated. Meanwhile, TLS has mechanisms to check whether the data integrity is maintained (it isn't modified in transit) and whether the client and server could communicate in a secure connection without eavesdropping by third parties.