Which of Chopin's works consists of 21 short pieces for solo piano?

It was Nocturnes the work by Frederic Chopin which has 21 pieces for a solo piano.

It was written between 1827 and 1846 and they might be considered the first short work for the piano. It is a well-known contemporary concert repertoire. However, he did not invent the Norturne, he just expanded it and so it became popular.

The Chopin nocturnes consist of 21 pieces for solo piano written by Frédéric Chopin