A progression is a sequence of numbers or elements that follow a specific pattern or rule. In mathematics, common types of progressions include arithmetic progressions, where each term increases by a constant value, and geometric progressions, where each term is multiplied by a constant factor. These sequences can be used to model various real-world situations, such as financial growth or population changes. Progressions are not limited to numbers; they can also apply to other areas, such as music and art. In music, a chord progression refers to a series of chords played in a sequence, creating a harmonious sound. Similarly, in art, a progression can describe the development of a theme or style over time, illustrating how ideas evolve.