A rafter is one of the sloping beams that forms the framework of a roof. If you've ever looked up into an attic or a barn and seen thick wooden beams running at an angle from the peak down to the walls, those are rafters. They're the skeleton that holds up the roof covering, whether that's shingles, tiles, or metal sheets.

Rafters work in pairs, meeting at the top to create the triangular shape you see in most roofs. This triangle design is incredibly strong because it distributes the weight of the roof (plus snow, rain, and wind) down to the walls. Ancient builders discovered this thousands of years ago, and we still use the same basic principle today.

In old churches and great halls, builders sometimes left the rafters visible on purpose, creating beautiful wooden ceilings with dramatic patterns. You can see this in medieval castles and traditional Japanese temples. Modern houses usually hide their rafters behind ceiling materials, but they're still there, doing the same essential job of holding everything up. Without rafters, a roof would have nothing to rest on and could collapse. Next time you're in an attic or see a house being built, look up and you'll spot these angled beams working quietly overhead.