I’m no expert, but I’ll give this a shot.
I believe a pentatonic scale is just a 5 note scale. There are several different version of the scale. Each one yields a different feel. For example, the minor pentatonic scale is great for blues.
If memory serves me, Katy’s lesson “New Moon Over My Shoulder” incorporates some pentatonic licks. Hopefully someone will correct me if I’m wrong. Might want to check it out.