Diminished intervals are musical intervals that are one half step smaller than a minor interval. For example, a diminished fifth is one half step smaller than a perfect fifth. These intervals create a tense and dissonant sound, often used in various musical genres to evoke feelings of unease or suspense. In music theory, diminished intervals can occur in both melodies and harmonies. They are commonly found in the context of diminished chords, which consist of stacked minor thirds. Understanding diminished intervals is essential for composers and musicians, as they add depth and complexity to musical compositions.