Spoken words provide a universal means of communication. Pictures and words in sand provide a way to communicate visually. Pencil and paper give permanency to communication.
Photographs create a permanent picture for all to see.
Tape recordings allow us an opportunity to hear voices. Film and video combine moving pictures and words. Computers provide an opportunity to interact with sight and sound. Internet allows people to communicate with each other throughout the world. All are means of communication that build upon each other providing exchange.