Omake (御負け?, often written おまけ) means extra or bonus in Japanese.
Its primary meaning is general and widespread. In USA, the term is most often used in a narrow sense by anime fans to describe special features on DVD releases: deleted scenes, interviews with the actors, "the making of" documentary clips, outtakes, amusing bloopers, and so forth. However, this use of the term actually predates the DVD medium by several years. For at least the past 50 years in Japan, omake of small character figurines and toys have been giveaways that come with soft drinks and candy and often the omake is more desired than the product being sold.                                                            -wikipedia