The document discusses the key components of communication including the message, medium, and channel. It defines a message as the core idea or information being exchanged between a sender and receiver. The sender must decide the main points and context to include. A message can be verbal, written, spoken or non-verbal. It typically has a purpose like conveying information, persuading, motivating or stimulating discussion. The medium is the channel used to deliver the message, such as written, oral or non-verbal, while the channel refers to the specific means of delivery like print, electronic, or physical signs. The choice of medium depends on factors like importance, cost, urgency and need for feedback.