What is Mutual TLS (mTLS)?

In standard TLS, only the server proves its identity to the client. In Mutual TLS (mTLS), both the client and the server validate each other's certificates:

• The client verifies the server's certificate.
• The server requests and verifies the client's certificate.
• Commonly used in zero-trust microservice networks (Service Meshes like Istio or Linkerd) to prevent unauthorized internal service communication.