Packets and Protocls
Protocols are a set of rules that define how computer devices communicate. A communications protocol is a system of digital message formats and rules for exchanging those messages in or between computing systems and in telecommunications. A protocol may have a formal description. Protocols may include signaling, authentication and error detection and correction capabilities.
In computer networking, a packet is a formatted unit of data carried by a packet mode computer network. Computer communications links that do not support packets, such as traditional point-to-point telecommunications links, simply transmit data as a series of bytes, characters, or bits alone. When data is formatted into packets, the bit rate of the communication medium can be better shared among users than if the network were circuit switched. its like collecting your luggage after a flight, you see all the bags go round the conveyor belt but only pick up the ones you own.