Ping and Communication

Tell me about ping in easy word and also tell me that data communication and computer network are related or not?

The ping is a tool or command that is used to test that if a system or server is available over the internet. You can check it just connect your system to the internet and than open MS-DOS or the CMD from run option in the start menu and type ping www.yahoo.com you will see the details how the server of yahoo has replied the packets in how much time if the result is the request timeout it means that there is some problem with the yahoo server or it is busy.