pro·to·col noun ˈprō-tə-ˌkȯl, -ˌkōl, -ˌkäl, -kəl
A protocol is a system of rules that explain the correct conduct and procedures to be followed in formal situations, meeting or conference.

The order of a system, or a movement.
: a plan for a scientific experiment or for medical treatment

That which enables the integrity of one’s character to honor or respect the structure of a team work.

The order in which things are done or presented, so that the harmony, the unity and the agreement which connects the different parties (people) involved in a pursuit of a collective goal may be maintained.

A protocol is a document that describes the details of a treaty or formal agreement between countries. 

There are different types of protocols; The protocol of an institution, the protocol of a constitution, the protocol of a meeting, the protocol of a company, the protocol of a government, the protocol of prayer, the protocol of a marriage, the protocol of a church etc… 

Full Definition of PROTOCOL:

: an original draft, minute, or record of a document, conference or transaction

b : the records or minutes of a diplomatic conference or congress that show officially the agreements arrived at by the negotiators

b : a set of conventions governing the treatment and especially the formatting of data in an electronic communications system <network protocols>

Examples of PROTOCOL
She first announced the leadership committee of the conference before she began her speech… 
The soldier’s actions constitute a breach of military protocol.
They did not follow the proper diplomatic protocols.
What is the proper protocol for declining a job offer?