What is the E3 expo?

By nearly a month , and in the history of the 10 to 12 June 2014 on the E3 Expo
There may be some people do not know what is at E3?
E3 or Electronic Entertainment Expo is a specialized exhibition displays the games, which will be issued in the year in which the exhibition was held.
The name came from the abbreviation of the first letter of each word Electronic Entertainment Expo to get a three letters E and so was chosen this name of the show
And the exhibition is held every year for 3 main days and a Sub day for SONY, MicroSoft, Nintendo to view their projects.
And the three days for the rest of the gaming companies .