protocol

protocol: a protocol is an established set of rules or procedures.

example: IP address = Internet Protocol

how its important: if the protocol is not followed, the end product is substandard, unsatisfactory, does not work. Example: You cannot generate a functional IP address without following the protocol.

his types: the term 'protocol' can be applied to everything from the etiquette of affairs of state (eg inauguration protocol would include the formal oaths etc seen in US politics yesterday) to professional practices, including engineering, medicine, law etc etc.

what are his specifications: depends on the protocol, doesn't it. Example: It won't help to swear in your IP address. (swearing at doesn't usually help either, just follow the established rules for the special case, for the best chance of achieving acceptable and functional results.)

Generally a protocol for an engineer means a communications protocol as Artsmith well knows.

If one wants to communicate with a device, one must understand the electrical aspects of the protocol, then one must understand the logical aspects.

Type the protocol name into Google or Wiki for the basics, we will help with the advanced stuff.