It means a set of rules or customs dealing with diplomatic transactions.

In computer science it refers to rules governing the transmission of data.

The official procedure governing affairs of state or diplomatic occasions.
The established code of procedure or behavior in any group, organization, or situation

Protocol may refer to:

[edit]Society

Protocol, etiquette
Protocol (diplomacy), the etiquette of diplomacy and affairs of state
Protocol (politics), a formal agreement between nation states
The Protocols of the Elders of Zion, an antisemitic tract
Kyoto Protocol, a protocol to the United Nations Framework Convention on Climate Change
Protocol I, an amendment to the Geneva Conventions
Protocol Relating to the Status of Refugees, a United Nations convention on the status of refugees

[edit]The arts

[edit]Science

Protocol (natural sciences), a predefined written procedural method of conducting experiments
Clinical trial protocol, a document that plans a clinical trial
Medical protocol (disambiguation), various meanings, most prominently including guidelines for medical treatment

[edit]Communications

Communications protocol, a set of rules & regulations that determine how data is transmitted in telecommunications and computer networking
Cryptographic protocol, a protocol for encrypting messages
Proprietary protocol, a telecommunications protocol that is patented
Quantum cryptography protocol, a protocol for encrypting messages
Simple Mail Transfer Protocol, a set of rules for the design of an electronic mail system

[edit]Computer related

AAA protocol, a computer security protocol
Protocol Buffers, a serialization format of computer software
Protocol (object-oriented programming), a common means for unrelated objects to communicate with each other
Routing protocol, a set of rules that determines how routers shall route communications
URI scheme, often referred to as "protocol"

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