What is the most common type of chord used in music?

The most common chord used in music is the triad, which is a chord consisting of three notes played simultaneously. A triad is formed by taking every other note in a scale, starting from a root note, and stacking them on top of each other. The three notes that make up a triad are called the root, the third, and the fifth. For example, a C major triad consists of the notes C, E, and G.

Triads are used extensively in all genres of music and are the foundation for many more complex chords. They are commonly used in pop, rock, blues, and classical music, among others. In addition to major and minor triads, there are also diminished and augmented triads, which are used less frequently.