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One certificate can be for more than one domain.

• altano 10y ago
  For example, a single cert can serve www.example.com as well as example.com
  • gummiruessel 10y ago
    That is true, but in this case I think Let's Encrypt and also parent to your comment mean different domains as in e.g. one certificate to cover all three of example.com, example.net and example.org.
    • 5ilv3r 10y ago
      The same mechanism in cert generation provides that functionality. Hostnames are hostnames. SAN certs just take a list of them.