What is the difference WCF and Web services?

What are the major differences between services and Web services? OR What is the difference WCF and Web services?

Web services can only be invoked by HTTP. While Service or a WCF component can be invoked by any protocol and any transport type. Second web services are not flexible. However, Services are flexible. If you make a new version of the service, then you need to just expose a new end. Therefore, services are agile and that is a very practical approach looking at the current business trends.