An atomizer or Coil is defined as any device that creates mist out of the liquid. It sounds complicated, but it is essentially just a heating coil made from a piece of resistance wire that heats up in order to create vapor out of e-liquid.
These coils also referred to as vape coils, they come in a variety of styles ranging from disposable coil heads to the do-it-yourself coil builds. These Coils are measured in Ohms, based on the amount of resistance they have. The lower the Ohms, the more power they will demand.