Chord types are the building blocks of music, defining the sound and emotion of a piece. The most common types include major, minor, diminished, and augmented chords. A major chord sounds happy and bright, while a minor chord has a sadder, more melancholic tone. Diminished chords create tension, often used in suspenseful moments, and augmented chords add a unique twist, making music feel unexpected. Understanding these chord types helps musicians create different moods and styles. For example, a pop song might rely heavily on major chords for an upbeat feel, while a blues track often uses minor chords to evoke deeper emotions. By mixing and matching these chords, artists can craft memorable melodies and harmonies.