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Definition
Transport Layer Security, or TLS, is a protocol that protects data as it travels across the internet. It helps keep information private by encrypting the connection between a user’s device and a website, app, or server.

Why it matters
TLS matters because it helps prevent attackers from reading or changing sensitive data in transit. It is commonly used to protect logins, payments, personal information, and other data exchanged online.

Example use case
A user enters payment details on a website. TLS encrypts the connection so the information is protected while it travels between the user’s browser and the website’s server.