A Wildcard SSL certificate allows you to secure multiple sub domains such as sales.yourdomain.com, support.yourdomain.com, etc.  You can secure as many sub domains as well as your main domain with this type of certificate.

If you're looking to only secure your main domain or folders, take a look at one of these certificates:
Comodo Essential SSL - Domain Validation
Comodo Instant SSL - Business Validation
Comodo Instant SSL PRO - Business Validation
Comodo SSL - Domain Validation
Comodo Instant SSL Premium - Business Validation
Comodo EV SSL - Extended Validation

If you're looking to secure multiple domains with one certificate, take a look at this certificate:
Comodo UCC SSL DV (Domain Validated)



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