it's a method of lighting charcoal
basically, you're lighting a big pile of unlit charcoal (full ring in the WSM if you're planning a long cook) with a few pieces of lit charcoal (I use 20-25).
the lit pieces cause a chain reaction and light the rest of the charcoal over a few hours.
I also bury a few pieces of smoke wood in the pile of unlit charcoal.
works great!!!