What is protocol? What are the main elements of a protocol?

 A protocol is a set of rules which is used to govern all the aspects of information communication.

The main elements of a protocol are:

• Syntax: It specifies the structure or format of the data. It also specifies the order in which they are presented.
• Semantics: It specifies the meaning of each section of bits.
• Timing: Timing specifies two characteristics: When data should be sent and how fast it can be sent.