That might be not a familiar word.
It is a kind of acoustic guitar which has nylon, or carbon strings, and used to have gut strings, played by fingers and nails and not by picks.
It is a good instrument to perform only with itself, not like steel-string guitar which is commonly for accompaniment for singing, bands.
You may think we only play classical music, but actually movie-music, bossa-nova, anime songs, any other music can be played.
As a lot of elderly maestros, female super guitarists who have tiny hands, proved this instrument is not for only young people who have huge hands but everyone.