Service Contract:

Service contracts describe the operation that service can

provide. For Eg, a Service provide to know the temperature

of the city based on the zip code, this service is called as

Service contract. It will be created using Service and

Operational Contract attribute.

Data Contract:

Data contract describes the custom data type which is

exposed to the client. This defines the data types, that are

passed to and from service. Data types like int, string are

identified by the client because it is already mention in

XML schema definition language document, but custom created

class or data types cannot be identified by the client e.g.

Employee data type. By using DataContract we can make client

to be aware of Employee data type that are returning or

passing parameter to the method.