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Web Development
An SSL certificate lets a website use HTTPS, encrypting data between the visitor and the server and showing the padlock in the browser.
The certificate proves the site's identity and enables encryption, so passwords, forms, and payments cannot be read in transit. Today the technology is TLS, though the SSL name stuck.
Free certificates from Let's Encrypt are widely used and renew automatically.
Example
After installing a certificate, a site moves from http:// to https://, and browsers stop showing a "Not secure" warning.
Why it matters
HTTPS is expected by visitors, required for many browser features, and a lightweight Google ranking signal. A site without it loses trust instantly.
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Web Development
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