A computer network system is created by connecting multiple computers one after the other. A computer network system is a system where everyone on the network can share and work together with the help of a computer. Its main purpose is to communicate with each other through computer. With the advancement of technology comes change in the level and type of communication. Nowadays , social networking with the help of Facebook , direct video communication through Skype is worth mentioning. Computer networking is also very important for resource sharing. In this case, hardware research shares , software research shares and information research shares increase the accuracy and speed of the work.