---
id: "tls"
kind: "glossary-term"
title: "TLS"
language: "en"
category: "DNS and technical foundations"
updated: "2026-10-04T14:01:23Z"
canonical: "https://tldlog.com/glossary/tls/"
translations:
  es: "https://tldlog.com/es/glosario/tls/"
  de: "https://tldlog.com/de/glossar/tls/"
  fr: "https://tldlog.com/fr/glossaire/tls/"
  it: "https://tldlog.com/it/glossario/tls/"
  pt-BR: "https://tldlog.com/pt/glossario/tls/"
  ru: "https://tldlog.com/ru/glossariy/tls/"
  zh-Hans: "https://tldlog.com/zh/cihui/tls/"
---

# TLS

Transport Layer Security

The standard that encrypts connections between a browser or app and a server, so others on the network cannot read or change the data. It puts the "s" in https addresses and the padlock that many browsers show. A certificate from a certificate authority proves which domain the server belongs to.

## related terms

- [CAA record](https://tldlog.com/glossary/caa-record/)
- [DANE](https://tldlog.com/glossary/dane/)
- [DoT](https://tldlog.com/glossary/dot/)
- [DoH](https://tldlog.com/glossary/doh/)
- [HTTPS](https://tldlog.com/glossary/https/)