This document defines the key components of communication: 1) A sender encodes a message and transmits it through a channel to a receiver. The sender aims to convey the message clearly based on the receiver's history and capabilities. 2) The receiver decodes the message and provides feedback to let the sender know if the message was understood. 3) There is always potential noise that can interfere with the message being received as intended. Effective communication considers the various forms communication can take, both verbal and nonverbal.