Building kits are sets of materials and instructions designed for constructing models or structures. They often include pieces made from plastic, wood, or metal, along with tools and guides to help users assemble the final product. Popular examples include LEGO sets, model airplanes, and puzzle kits. These kits cater to various skill levels, from beginners to advanced builders. They can be educational, promoting skills like problem-solving and creativity, or simply serve as a fun hobby. Many people enjoy building kits as a way to relax and engage in hands-on activities, either alone or with friends and family.