What is the difference between SAN and Wildcard?

Wildcard certificates vs SAN certificates

Wildcard certificates are similar to SAN certificates with some restrictions. With a wildcard certificate, you can secure multiple sub-domains with a single unique root domain.

For example, if you have a wildcard certificate for www.mycompany.com, it will also secure intranet.mycompany.com and email.mycompany.com with the same certificate.

However, you will not be able to secure multiple unique domains such as, www.mycompany.net and www.mycompany.org.

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