The present form is the base form of a verb used for present time or habits. In I walk to school and They eat lunch, walk and eat are present forms.
Most subjects keep the base form, but with he, she, or it the verb usually adds an ending, as in she walks.
The present form of a verb shows a habit or something happening now. I eat breakfast every morning uses eat as a present form because the action repeats as part of a routine.
It also works for the moment you are in. The kids play outside right now puts play squarely in the present, describing what is happening as you speak. Same verb shape, different job: one points at a routine, the other at this very minute.