Entertaiment is a very broad category, encompassing any type of activity that affords pleasure, diversion or amusement. It includes activities as varied as the solving of a crossword puzzle or a daily newspaper column, to going to a movie or to a concert, attending a sporting event or even visiting a theme park. Many entertainments also have serious intent, such as a religious festival or a political satire. Moreover, entertainments have the remarkable capacity to be reused in new mediums and with new audiences. The story of Scheherazade, for example, inspired orchestral works by Rimsky-Korsakov, Ravel and Szymanowski; a film by Pasolini; and an innovative video game.
You may sometimes see the word entertainment abbreviated to entmt on a flier or in industry news publications, where space is limited.