A Unified Communications Certificate (UCC) is an SSL certificate that secures multiple domain names and multiple host names within a domain name. A 5 UCC SSL lets you secure a primary domain name and up to 4 additional Subject Alternative Names (SANs) in a single certificate. 5 UCCs are ideal for Microsoft® Exchange Server.
SSL Certificates are small data files that digitally bind a cryptographic key to an organization’s details. When installed on a web server, it activates the padlock and the https protocol and allows secure connections from a web server to a browser.