There are some set of rules and conventions for communication between Network Devices, which are called Protocol. A protocol is also called an access method.
In other words, Protocol is a standard that is used by the exchange in the data computer network (like local area network, Internet, Intranet, etc). Each protocol has its own method, with the help of which it determines how the data will be sent, what to do when the data is received, how to compress the data, and how to manage any kind of errors between them Have to do Thus, protocols are uniform set of rules, which help two devices connect to successfully connect and data, along with the protocol determines how to transmit between the data network and the computing device.
The most common and non-protocol protocol is HTTP (HyperText Transfer Protocol) – which is used to transmit and exchange data in world-wide-web (Internet). Other protocol examples are – FTP (File Transfer Protocol), SMTP (Simple Mail Transfer Protocol) and TCP / IP (Transfer Control Protocol / Internet Protocol).