What is the role of a SAN (Subject Alternative Name) in an SSL certificate?

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Grade: Education Subject: Support
What is the role of a SAN (Subject Alternative Name) in an SSL certificate?
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A SAN allows a single SSL certificate to secure multiple domain names and subdomains. Instead of having separate certificates for each domain, a SAN certificate lists all the domain names it's authorized to secure. This is especially useful for websites with multiple subdomains or a complex domain structure, simplifying certificate management.