First Definition

• The first definition of protocol that Merriam-Webster's dictionary lists is "an original draft, minute or record of a document or transaction."
  
  

Use in Science

• In science, a protocol is a written procedure to be followed when conducting experiments so they can be replicated exactly.
  
  

Etiquette

• The word protocol also refers to a code of conduct, particularly in reference to ceremonies and etiquette followed by diplomats.
  
  

Agreements

• A protocol is also defined by Merriam Webster's as "the records or minutes of a diplomatic conference or congress that show officially the agreements arrived at by the negotiators."
  
  

Computer Use

• A protocol in computer science is "a set of rules or procedures for transmitting data between electronic devices." HTTP (hypertext transfer protocol) and FTP (file transfer protocol) are examples of Internet protocols.