A modal system is a framework used in music theory that categorizes different scales and modes. Each mode is derived from a parent scale, such as the major scale or minor scale, and has its own unique sequence of whole and half steps. The seven common modes include Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, and Locrian, each offering distinct emotional qualities and tonal characteristics. In addition to music, the term "modal" can also refer to logic and philosophy, where it describes different modes of truth, such as necessity and possibility. In this context, a modal system helps analyze statements and arguments by considering various scenarios and their implications. This approach is essential in fields like computer science and linguistics, where understanding different possibilities is crucial for problem-solving and communication.