What interval is created between the notes on the 3rd fret and 4th fret of the same string?

The interval created between the notes on the 3rd fret and 4th fret of the same string is a half step. On a guitar, each fret represents a half step increase in pitch. When you move from one fret to the next on the same string, you are effectively raising the pitch of the note by a semitone, which is defined as a half step.

In Western music theory, a half step is the smallest interval commonly used, and it effectively shifts the note to its nearest neighbor in terms of pitch. For example, if you play an E note on the 3rd fret of the 2nd string (which is a D note), the note on the 4th fret of the same string would be an F note, which is one half step higher than the D.

While choices like whole step and major second represent larger intervals (whole steps consist of two half steps, while a major second spans a whole tone), they do not apply to the immediate relationship between the 3rd and 4th frets, which is just a single half step apart. The minor second also reflects a similar interval, but it typically refers to the relationship between the notes C and C# specifically, whereas the term "