Folding screens have become a common sight in recent years, thanks in large part to Samsung’s two lines of foldable phones, the Z Flip and Z Fold. As other manufacturers join in, foldable device prices are quickly going down, promising a new age of personal computing. But how do folding screens actually work?

Whether you’ve always been curious about how folding screens work or have yet to consider it, we’ll give you a crash course in foldable displays and the cool tech that makes them possible.