Wildcard SSL certs work in a similar way to a regular single domain certificate. However, they have the advantage of securing all and any sub-domains you may have in your network. This certificate saves money, and admin time. * used before a website name while enrolling a certificate, denotes a wild card SSL certificate. Https.in provides for a range of wild card ssl certificates to suit every budget and hosting situation.
The 2023 Guide to SSL Certificate for website