Lego Technic

Lego Technic is a line of Lego sets that focus on engineering and construction. These sets are more expensive than traditional Lego sets, but they often include more realistic and complex designs. Lego Technic sets are popular with adult collectors, who appreciate the level of detail and complexity in many of the models.
 
It consists of small, detachable, modular pieces that can be combined to create complex machines and devices. The pieces can be connected using a variety of connectors, and the system is designed to allow for the quick and easy creation of complicated structures.