Telephone | Letter |
It is a fast mode of communication. | It is a slow mode of communication. |
We can talk over the phone; this means that we can hear the voice of the person far away from us. | We can only write to each other through letters. |
Postman is not involved. | Postman is involved. |
It is an electronic mode of communication where voice is transferred through wires and satellites. | It is a manual mode of communication where a letter is transferred to a post office by a postman and then to the receiver by another postman from a post office. |
It is a two-way mode of communication. | It is a one-way mode of communication. |