The three core components of WCF are as follows:
Service class : In the runtime layer, you will find the behaviors that occur only when a service is actually running, i.e., the runtime behaviors of the service. Throttling is used to control the number of messages processed that can be altered if the service grows to a preset limit.
Endpoint : WCF Service makes available a set of endpoints. All Endpoints are portals through which users are able to communicate with the outside world. Endpoints are composed of three components: Address, Binding, and Contract.
Hosting Environment : It is the host application that is responsible for controlling the service's lifetime. Self-Hosting or management of services can be done by the existing hosting process.
