A site plan is like a map that shows everything that will be built on a piece of land. It can help people understand what a building or area will look like when it is finished. Imagine you want to build a big treehouse in your backyard. You would draw a site plan to show where the treehouse will go, how big it will be, and any trees or plants that might be in the way. A site plan helps you plan ahead and make sure everything fits together nicely.