SNI (Server Name Indication) is an extension to the TLS protocol by which a client indicates which hostname it is attempting to connect to at the start of the handshaking process.
This allows a server to present multiple certificates on the same IP address and TCP port number and hence allows multiple secure (HTTPS) websites (or any other Service over TLS) to be served off the same IP address without requiring all those sites to use the same certificate.
It is the conceptual equivalent to HTTP/1.1 name-based virtual hosting, but for HTTPS.
This means you do not need a dedicated IP anymore to have an SSL for your domain name, unless you need the dedicated IP for any other reason.
Our cPanel shared hosting accounts support SNI.