UDP – User Datagram Protocol
Basically UDP is used to send the data in both the directions but still different from TCP/IP. The major difference is a security and speed. Both are the solution of same problem “sending data over internet connection”.
In this tutorial you will be going through the concept of UDP, what is UDP Ports with maximum examples on UDP or User data protocol.
Reference:
http://www.roseindia.net/software-tutorials/detail/18363
User Datagram Protocol Tutorial – Step by Step Guide
http://www.roseindia.net/java/example/java/net/udp/