Android supports networking for enabling multiple functionalities ranging from social networking to cloud computing.
Few types of android applications that make use of networking are :
- SMS (Short Message Service).
SMS is a communication service component that enables the exchange of short text messages between mobile devices.
- Internet resource – based applications.
- Social networking applications.
Social networking applications, such as Twitter, Facebook etc.. are important ways / methods for people to connect to each other.
Source : The Android Developer’s Cookbook