Computer

The first electronic digital computers were developed between 1940 and 1945 in the United Kingdom and United States. Originally they were the size of a large room.

I think that this is the best medium of communication, because the computer contains all of the last mediums.

Currently, if you have a computer and if you have a connection to the internet you can be in contact with people in other country or in other city. You can see and listen the other person, you can send e-mails, you can see and read the news, you can listen music and you can do something more.