K'Nex toys are a versatile construction system that allows children (and even adults) to build a wide range of models, from simple structures to complex machines. Made of plastic rods, connectors, and other components, K'Nex pieces interlock to create 3D structures, offering a hands-on, interactive way to explore engineering, design, and creativity. The system promotes STEM learning, encouraging problem-solving, fine motor skills, and spatial awareness as kids figure out how to make their designs come to life.