List different parts of a Communication System?

There are five main parts of the communication system:

1. Message: Message is the data which needs to be sent .It can be in any form like text, audio, number, video, images.
2. Sender: As the name suggests is the device that sends the message. It can be a computer, telephone handset, workstation, video camera and so on.
3. Receiver: The device where the message is received is called a receiver. It can be a computer, telephone handset, workstation, video camera and so on.
4. Transmission medium: It is a physical path in the data communication network by which the data travel to its destination. Source occupies the one end to send data whereas receives use another end to receive the data. Examples of mediums are twisted-pair cable, coaxial cable, fibre-optic cable etc.
5. Protocol: It is a set of rules that regulates the data communication. It is an agreement between the two devices for successful communication. Without the protocol, it is not possible to communicate even though the devices are connected. It handles a lot of things like how the data will be sent or traveled, to ensure data is received or not and many others.