A jazz band is a group of musicians who play jazz music, a lively and expressive genre that originated in the early 20th century. Typically, a jazz band includes instruments like the trumpet, saxophone, trombone, piano, double bass, and drums. Each musician often takes turns improvising, which means they create music on the spot, adding a unique flair to each performance. Jazz bands can vary in size, from small combos to larger big bands, and they often perform in clubs, festivals, and concerts. The energy and spontaneity of a jazz band create an exciting atmosphere, making it a favorite for music lovers around the world.