Major - A chord consisting of a root note, a major third interval, and a perfect fifth interval. It is typically denoted by the letter name of the root note.
Diminished - A chord consisting of a root note, a minor third interval, and a diminished fifth interval. It is typically denoted by adding a small circle (°) after the letter name of the root note.
Augmented - A chord consisting of a root note, a major third interval, and an augmented fifth interval. It is typically denoted by adding a plus sign (+) after the letter name of the root note.
Minor - A chord consisting of a root note, a minor third interval, and a perfect fifth interval. It is typically denoted by adding a lowercase "m" after the letter name of the root note.