Technical Definition
SSL (Secure Sockets Layer) certificate enables HTTPS encryption between server and browser. Types: Domain Validated (DV), Organization Validated (OV), Extended Validation (EV). Free certificates available from Let's Encrypt. For SEO: HTTPS is a ranking signal. Ensure certificate is valid, not expired, and properly installed. Check for mixed content after implementation.
Simple Explanation (ELI13)
An SSL certificate is what makes HTTPS work. It's like a digital ID card that proves your website is who it claims to be and encrypts the connection. You can get free SSL certificates from Let's Encrypt. Having one is basically required now, both for security and because Google prefers HTTPS sites.
Related Terms
HTTPS, Security, Mixed Content, Trust
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