Email message provide a good example for each part of this theory. People writing the message are the sources. The computer are the encoders. The email are the messages. The chanel is the internet and how it is accessed. The email is decoded by another personal computer, at witch point the receivers can read the messages in their inboxes
My best friend. His frightening appearance, he is tall and thin. His body is green, his face is round and not I, he has 1 eyes, and he's not. He's an alien. His name is David David from Uranus