The recorder is a musical instrument that is a type of flute. It is shaped like a tube with one end bigger than the other end. A recorder player puts the bigger end in their mouth and blows into it.
In Europe, people started to play the recorder in medieval times. The recorder was often used by musicians to sound like bird songs. Purcell, Bach, Telemann and Vivaldi all wrote music for the recorder. By the 1900s very few people played the recorder. They liked the flute and other instruments better than the recorder. These instruments are louder than the recorder and are better for playing difficult music.
In the 1900s more people started to learn the recorder again. One reason was that people wanted to play old music on old kinds of instruments. A second reason was that the recorder is a good instrument for children to learn about music.