A digital certificate used to help establish an encrypted HTTPS connection and confirm the domain involved in that connection. Many hosts provide certificates automatically, but owners should still watch renewals, warnings, and mixed insecure content.
How SSL Certificate Works
An SSL/TLS certificate connects a domain to cryptographic identity information used during an HTTPS connection. The browser uses the certificate as part of verifying the server and establishing an encrypted session.
Simple Example
A site’s certificate expires and browsers begin warning visitors until the certificate is renewed.
Why It Matters for Beginners
This matters because a valid certificate is necessary for normal HTTPS connections. Expired or misconfigured certificates can create browser warnings and break integrations.
A Common Mistake
Ignoring expiration or domain mismatches until browsers begin showing warnings.
Related Terms
- HTTPS
- Encryption
- Hosting