What does origami mean?

1. Valley folding, also called hand folding, basically means that the paper is folded up or down in the positive direction, so that the folded part forms the shape of a valley. 2. Mountain folding, also called hand folding, is basically to fold the paper up or down in the opposite direction, so that the folded part forms the shape of a mountain peak. 3. fold (Flod and Unfold), also known as fold, is to open and recover after folding, forming a unique fold to facilitate the later folding process. From Baidu Encyclopedia.