Deploying a wildcard certificate is one strategy to:
Secure the certificate’s private key.
Increase the certificate’s encryption key length.
Extend the renewal date of the certificate.
Reduce the certificate management burden.
A wildcard certificate is a public key certificate which can be used with multiple subdomains of a domain. This
saves money and reduces the management burden of managing multiple certificates, one for each subdomain.
A single Wildcard certificate for *.example.com, will secure all these domains:
Because the wildcard only covers one level of subdomains (the asterisk doesn’t match full stops), these
domains would not be valid for the certificate: