SSL/TLS Explained

TLS gives applications a private, authenticated, tamper-resistant channel over an untrusted network. It is the security layer behind HTTPS and many internal service-to-service calls.

In production systems, TLS is not just "encryption." It is how clients verify they reached the right service, how load balancers and gateways terminate HTTPS safely, and how internal platforms authenticate workloads with mutual TLS.

This chapter covers how TLS protects network traffic and how those guarantees show up in real system designs.