Stride piano is a style of jazz piano playing that emerged in the early 20th century, particularly in the 1920s. It is characterized by a strong, rhythmic left hand that plays a bass line and chords, while the right hand plays melodies and improvisations. This technique creates a lively and energetic sound, making it popular in jazz clubs and dance halls. The term "stride" refers to the way the left hand "strides" between low bass notes and higher chords, often spanning a wide range on the keyboard. Notable stride pianists include James P. Johnson and Fats Waller, who helped popularize this style and influenced many future jazz musicians.