Augmented intervals are musical intervals that are one half step larger than a perfect or major interval. For example, an augmented fourth is one half step larger than a perfect fourth. These intervals create a sense of tension and can be used to add complexity to melodies and harmonies. In music theory, augmented intervals are often notated with a "+" sign. They are commonly found in various musical genres, including classical and jazz, and can contribute to the emotional impact of a piece. Understanding augmented intervals is essential for composers and musicians working with music theory and harmony.