| Term | Definition |
| message | communication in speech, writing or by signals |
| email | sending letters over the internet |
| signal | an act of communication that starts an action |
| language | words, their pronunciation and method of combining them to communicate |
| telegraph | a machine that electrically sends coded signals over a wire |
| Morse Code | a code that consists of dashes and dots or long and short sounds used to send messages |
| transmit | to send |
| Internet | the world wide web; a form of communication sent over telephone wires or by satellites |