A keyboard instrument is a musical tool played making use of a keyboard, a row of bars which are pressed by the fingers. One of the most typical of these are the piano, body organ, and numerous digital key-boards, including synthesizers as well as electronic pianos. Various other key-board tools consist of celestas, which are struck idiophones operated by a key-board, and also carillons, which are usually housed in a belfry or belfries of churches or courts. 
Today, the term keyboard commonly describes keyboard-style synthesizers. Under the fingers of a sensitive entertainer, the key-board may additionally be used to control dynamics, wording, shielding, expression, and various other aspects of expression– relying on the design and intrinsic capacities of the tool. 
Another essential use of words keyboard is in historical musicology, where it means a tool whose identity can not be firmly developed. Especially in the 18th century, the harpsichord, the clavichord, and the early piano were in competition, as well as the exact same piece might be played on more than one. Hence, in a phrase such as “Mozart succeeded as a keyboard player,” the word key-board is typically complete.