What is a progression in music and how does it contribute to the overall structure and harmony of a musical piece?

In music, a progression is a series of chords that create a sense of movement and direction within a piece. Progressions help establish the harmonic framework of a composition, providing a foundation for melodies and creating tension and resolution. They contribute to the overall structure and harmony of a musical piece by guiding the listener through different emotional and tonal landscapes, enhancing the overall musical experience.