Single
If you only need to secure one domain (e.g. .example.com), then you should purchase a single domain, or standard certificate. You have your choice of trust level – DV, OV, or EV.
If, however, you need to secure multiple domains (e.g. for regional sites - .com, .co.uk, .de), or multiple sub-domains (e.g. for customer areas – login-secure.example.com), you should consider purchasing a Wildcard or Multi-domain Certificate. Using one certificate to cover multiple fully qualified domain names (FQDNs) is more cost-effective than purchasing multiple individual certificates and simplifies management, especially when it comes time for certificate renewal.
Multiple Domains
If you want to secure multiple domains (e.g. example.com, example.net, example.co.uk) with one certificate, then you should purchase a Multi-domain Certificate. Multi-domain Certificates allow you to secure multiple domain names using only one certificate. The domains are listed as Subject Alternative Names (SANs) within the certificate, which is why you’ll often hear people referring to these as SAN certificates.
Wildcard
If you want to secure multiple sub-domains with one certificate, you can use either a Wildcard. Which one is best for you depends on the number of sub-domains you need to secure and the trust level you want.
If you have a lot of sub-domains, or anticipate adding more in the future, you should consider a Wildcard Certificate because you can secure an unlimited number of sites directly under the domain. Wildcard Certificates have a common name of the format *.myduniahosting.com, so it will secure the examples listed above with a single certificate. Wildcard Certificates are supported by the DV and OV products, but industry requirements do not permit EV Wildcard Certificates.
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