Jazz improvisation is a spontaneous musical creation that allows musicians to express themselves in real-time. It often involves taking a basic melody or chord progression and adding personal flair through variations in rhythm, melody, and harmony. This practice is a hallmark of jazz music, showcasing the creativity and skill of the performer. Musicians typically rely on their knowledge of music theory and their understanding of the song's structure to guide their improvisation. Instruments commonly used in jazz include the saxophone, trumpet, and piano, each contributing unique sounds and styles to the improvisational process.