# TLS

> Transport Layer Security — the encryption layer behind HTTPS that keeps traffic private and proves the site you reached is the site you meant.

Without TLS, everything between browser and server — passwords, card numbers, the page itself — is readable and rewritable by anyone on the path: the café wifi, the ISP, a state firewall. TLS encrypts the channel and the certificate proves you reached the real site, not an impersonator.

What was a differentiator in 2010 is a baseline in 2025: browsers mark plain HTTP 'not secure', search engines rank HTTPS, and certificates are free and auto-renewing. Running HTTP today is not a choice, it is a bug that tells every visitor you stopped maintaining the site.

## Related terms

- https://dfieldsolutions.com/en/glossary/encryption-at-rest.md
- https://dfieldsolutions.com/en/glossary/security-headers.md
- https://dfieldsolutions.com/en/glossary/session-hijacking.md

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Source: https://dfieldsolutions.com/en/glossary/tls
DField Solutions — Dunakeszi, Hungary — dezso@dfieldsolutions.com
Booking: see https://dfieldsolutions.com/en/contact