A benefit is something a subscriber receives as a thank-you for their support. It's like a high-five or a pat on the shoulder for good work done on the journey toward a goal. A benefit is part of a plan that you offer to potential subscribers on your campaign site. It helps you convince followers who are impressed by your project but still ask themselves: what's in it for me? It's just like getting a meal on a flight included in the ticket price, or a free packet of tissues at the pharmacy. These little benefits show your appreciation to your supporters. In the best case, they can even be of practical use to you subscribers. You can find some examples of benefits here.