Here is a concise article on the differences between SSL and TLS. When configuring an email client like Outlook to access email accounts that offer encryption to protect the data goes between the email client program and the email server, some form of encryption is used to ensure the confidentiality of the data, and that the information has not been tampered with in transit. SSL and TLS are the current industry standards for this protection. The take-home lessons by this article is SSL is older, but it is still useful. TLS, despite the new name, is a just an evolutionary update of SSL, coming about because of politics and not due to some major technological leap. With that, I hope the Internet governing body would dump the TLS name to call it SSL version 4 with all subsequent updates having higher numbers. This would remove the confusion when choosing which protocol to use as with configuring programs like Outlook.
https://sectigostore.com/blog/ssl-vs-tls-decoding-the-difference-between-ssl-and-tls/#:~:text=SSL%20is%20a%20cryptographic%20protocol,and%20client%20via%20implicit%20connections.
