What is kit? What is kit? A set of articles or implements used for a specific purpose: a survival kit; a shaving kit. A container for such a set.A set of parts or materials to be assembled: a model airplane kit. A packaged set of related materials: a sales kit. A collection of clothing and other personal effects used for travel.A container, such as a bag, valise, or knapsack, for storing or holding such a collection.the (whole) kit and caboodle Informal The entire collection or lot.A kitten.A young, often undersized fur-bearing animal.A tiny, narrow violin used by dancing masters in the 17th and 18th centuries.