The purpose of a process analysis essay is to explain how to do something or how something works. In either case, the formula for a process analysis essay remains the same. The process is articulated into clear, definitive steps.
Almost everything we do involves following a step-by-step process. From riding a bike as children to learning various jobs as adults, we initially needed instructions to effectively execute the task. Likewise, we have likely had to instruct others, so we know how important good directions are—and how frustrating it is when they are poorly put together.