Definition

SSL certificate

An SSL certificate is the digital credential that lets a site serve HTTPS. It encrypts traffic between browser and server and proves the site is who it claims to be. Every certificate has an expiry date, after which browsers stop trusting it.

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SSL & Domain Expiry Checker

Related terms

TLS

The protocol that encrypts traffic between a browser and a server.

HTTPS

HTTP carried over an encrypted TLS connection.

HSTS

A header that forces browsers to use HTTPS for a site.

Mixed content

An HTTPS page that loads some resources over insecure HTTP.

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