What are the different guitar modes scales and how can they be applied in music theory and improvisation?

Guitar modes are variations of the major scale that start and end on different notes. The most common modes are Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, and Locrian. Each mode has a unique sound and can be used to create different moods in music. In Music Theory, modes are used to understand harmony and chord progressions. In improvisation, Guitarists can use modes to create interesting melodies and solos by emphasizing the characteristic notes of each mode over different chords.