Chord

A chord is a sound composed by more than one note played at the same time.

On bowed instruments, violin, viola, etc., a chord is done by playing two or more string simultaneously, or in more or less rapid succession.

Chords are quite demanding for performers because they require the use of two, three or even four fingers at the same time, with the player controlling the exact intonation of each note and the conduct of the bow on the strings. They require even more coordination than normal playing.