What is a protocol? When two computers needs to communicate between them and in order understand each other it s better if both computers follow common format when they are communicating. That is where the protocol comes into the picture. Protocol is set of rules and procedures which provide to establish a meaningful communication. Protocol specifies, format to use when data should be send order of the data error codes what data mean and etc. Example from day today life What is TCP/IP? In order to do a better end to end communication via network we use protocol. That special set of rules and procedures used for Internet are called TCP/IP. Now lets go in to the more deep in TCP/IP. How TCP/IP Works? Network protocol can easily described using OSI model. Application and Presentation Layer Describe the programs like your web browsers we directly interacted with. This layer has protocols ,If you visi...