What is the definition of "upbeat" in music and how does it contribute to the overall mood and energy of a song?

"Upbeat" in music refers to a fast-paced, lively rhythm that creates a sense of positivity and energy. It typically features a strong emphasis on the off-beat, giving the music a bouncy and uplifting feel. This upbeat rhythm contributes to the overall mood of a song by making it more dynamic, engaging, and uplifting, encouraging listeners to feel happy and energized.