The Minor Pentatonic Scale, is a five note scale, derived from the Minor Scale. The minor pentatonic scale being a 5 note scale, utilizes the important notes of the minor scale. Those notes are the root, minor third, the perfect fourth and fifth, and the minor seventh. As you can imagine, using those very important chord tones, makes the Minor Pentatonic Scale an extremely versatile scale used in a lot of modern popular music.
Using those notes (root, m3, p4, p5, m7) to create the scale, means we need to pick a root note and find those intervals around it to create the scale. For example, using the A Minor Pentatonic Scale, if we list out all twelve notes we have:
A - A♯ - B - C - C♯ - D - D♯ - E - F - F♯ - G - G♯
If we follow a semitone pattern:
