Real web services are those which are built using web technologies and are accessible over the internet. They are typically used to provide some functionality or data to web-based applications.
In computing, a web service is a web application that uses open, XML-based standards to exchange data with other systems over the World Wide Web.
In short, "real" web services are those that provide a well-designed, easy-to-use interface that make it simple for developers to access the data and functionality they need. While there are many factors that go into creating a successful web service, these five characteristics are essential for any service that wants to be considered "real."