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The tres is a Cuban guitar-like instrument with three pairs (courses) of strings. It is the defining melodic-rhythmic instrument of son cubano and its ancestor genres.
According to Wikipedia, the tres developed in the second half of the 19th century in eastern Cuba, in nengón, kiribá, changüí and son. It probably derives from the Spanish guitar and from the laúd and bandola of punto. According to Helio Orovio, Nené Manfugás brought the tres from Baracoa to Santiago de Cuba in 1892; in the west it was virtually unknown until about 1895.
The tres's most important contribution to Cuban music is the guajeo — a repeating syncopated riff that locks into the clave pattern. The guajeo is the tres's primary voice in son ensembles, providing melodic momentum and rhythmic groove simultaneously.
The guajeo also exists on the piano. According to Wikipedia, in the late 1930s Arsenio Rodríguez put the piano in his conjunto in place of the guitar; since then piano guajeos, the montunos, have been one of the most recognisable elements of Cuban music and salsa. See Piano.
According to EcuRed, the tres is the son instrument par excellence. In the son conjunto it starts the piece, plays the ornaments (floreos) and accompanies at the same time. It usually alternates its melodic improvisations with the guitar. It also plays the rayado, rhythmically broken chords. The tres takes part in every kind of son: changüí, sucu-sucu, son montuno and guaracha.
In changüí, according to Wikipedia, the tres usually has the traditional octave tuning, and the guajeo consists entirely of offbeats. The changüí technique influenced later son musicians: pianist Lilí Martínez and tresero Pancho Amat learned the style from Chito Latamblé (Grupo Changüí de Guantánamo).