The word emoji means pictograph. Emoji originated from Japanese words "e" (絵, "picture") + moji (文字, "character").
Since international inclusion in Apple iPhone, then Android and other mobile operating systems, emoji have become popular worldwide.
In total there are 2,666 emojis in the Unicode Standard as of May 2017.
While I occasionally include emoji in my text messages, I am not convinced about watching The Emoji Movie on a big screen.
Aloha -- Cathi