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What is an SSL certificate?

Reviewed 1 November 2026 · MareDiRoso editorial team

HTTPS encrypts traffic between a browser and the server and authenticates the domain through a certificate. It protects data in transit; it does not prove that a business is trustworthy or remove malware. Check certificate coverage, redirects, mixed content and automated renewal.

What to check

  1. Check the main domain and www coverage.
  2. Test renewal and expiry alerts.
  3. Check HTTPS redirects and assets loaded over HTTP.

Let’s Encrypt: How it works ↗

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