Wildcard certificate

A wildcard certificate is a type of SSL/TLS certificate that allows you to secure multiple subdomains of a domain with a single certificate. It is characterized by the use of an asterisk (*) in the domain name, which acts as a placeholder for any subdomain. For example, a wildcard certificate for `*.example.com` can be used to secure: - www.example.com - mail.example.com - blog.example.com - any.other.subdomain.example.