Compas is like a special kind of computer program that helps architects and engineers make 3D models of buildings and other structures. It's kind of like a really fancy tool that they use to help them figure out how to make a building that is strong and safe and looks good too.
The program has a lot of cool features, like being able to show the building in different colors to help people understand what it will look like, and being able to calculate things like how much weight the structure can hold. It's like having a little robot helper that can do all kinds of math and design work for you!
So basically, Compas is like a really smart tool that architects and engineers use to make buildings and other structures look awesome and work really well.