// Security
An SSL (Secure Sockets Layer) certificate is a digital certificate that authenticates a website's identity and enables an encrypted HTTPS connection. Modern websites use TLS certificates, though the term SSL persists in common usage.
Why it matters: Every public website needs a valid SSL/TLS certificate to serve content over HTTPS. Use a certificate from a trusted CA, configure automatic renewal, and monitor expiry. HTTPS is a lightweight ranking signal and a requirement for many web capabilities; browsers warn users on non-HTTPS pages.
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