Here is some information on SSL Certificates.
SSL (Secure Sockets Layer) and its successor, TLS (Transport Layer Security), are protocols for establishing authenticated and encrypted links between networked computers. Although the SSL protocol was deprecated with the release of TLS 1.0 in 1999, it is still common to refer to these related technologies as “SSL” or “SSL/TLS.”
An SSL certificate also includes identifying information about a website, including its domain name and, optionally, identifying information about the site’s owner. If the web server’s SSL certificate is signed by a publicly trusted certificate authority (CA), like SSL.com, digitally signed content from the server will be trusted by end users’ web browsers and operating systems as authentic.
An SSL certificate is a type of X.509 certificate.
TLS (Transport Layer Security), released in 1999, is the successor to the SSL (Secure Sockets Layer) protocol for authentication and encryption. TLS 1.3 is defined in in RFC 8446 (August 2018).
At one time it was a mandatory requirement to have a dedicated IP for each SSL certificate on a web server. This is no longer the case due to a technology called Server Name Indication (SNI). Your hosting platform will specifically have to support SNI. You can find out more information about SNI in this SSL.com article.
For maximum compatibility, port
443 is the standard, thus recommended, port used for secured SSL/TLS communications. However, any port can be used.