WCF is a combination of NET remoting, MSMQ, Web Service and COM+.
WCF = Web Service + Remoting + MSMQ + COM+

WCF Service can be hosted in multiple protocols like http, tcp etc. Since it has COM+ so we can call two different WCF services in a transaction.

WCF has three main component need to define:

• Service Class
• Hosting Environment
• End Point

There are four bindings supported by WCF:

• BasicHttpBinding:
  • Simple SOAP over HTTP with no encryption.
• WsHttpBinding:
  • Simple SOAP over HTTP with encryption.
• NetHttpBinding:
  • Binary-encoded SOAP, including support for reliable message transfer, security and transaction directly over TCP.
• NetNamedPipesBinding:
  • Binary-encoded SOAP over named pipes. This binding usable for WCF-to-WCF communication.