A "Half Step" in music refers to the smallest interval between two notes. It is the distance between adjacent keys on a piano keyboard, whether they are white or black. For example, moving from C to C# or from E to F represents a half step. This interval is crucial for creating scales, melodies, and harmonies. In Western music, half steps are essential for constructing the chromatic scale, which includes all twelve pitches within an octave. Understanding half steps helps musicians develop their skills in playing instruments, reading music, and composing songs.