https://coderanch.com/t/464365/java/Advantages-RESTful-web-services

There are many 1. Only datatransfer - Considering you are using restFul Services it will transfer only data too and from server. This will help the process boost speed. 2. Manageable - Service are more manageable in term of changes in the data format or data itself. 3. Scalable - You can scale the services to any level. 4. Independant - Web services are platform independent so you can have a .net server to serve a android app.

web service is a standard used for exchanging information between applications or systems with various platforms can use web services to exchange information over Internet using http/https protocol.Main Advantages are foloowing: 1)More light weight client Application 2)facility of re usage Function 3)More secure & fast database interaction. 4)less database hitRe-usage of existing functionalities:While designing the web service, we could also get significant benefits by reusing the existing functionalities by exposing them as web methods.