What is WCF throttling and how does it improve scalability?

WCF throttling controls the number of concurrent calls, sessions, and instances to protect service resources.

Throttling in WCF is configured via service behavior settings such as maxConcurrentCalls, maxConcurrentInstances, and maxConcurrentSessions. It prevents resource exhaustion and ensures fair usage of CPU, memory, and threads across multiple clients. Without throttling, a service can become unstable under heavy load or denial-of-service conditions.