A Looper Pedal is a simple floor-based recording device that records your guitar playing and loops (plays) it back through your amp, over and over.
Essentially, the looper pedal has three jobs:
1. It Records a Primary Loop (a guitar part).
2. It Plays this primary loop back through your amp over and over.
3. It then Records additional guitar parts (Layers), which it then Plays back over the top of your original Primary Loop.