Technic is a line of LEGO interconnecting plastic rods and parts.
The purpose of this series is to create more advanced models with more complex movable arms, such as machines with wheels, in addition to the simpler BRICK -building properties of normal Lego. The concept was introduced as the Expert Builder series and originally Technical Sets in 1977, and was renamed Technic in 1984.
Technic sets are often characterized by the presence of special pieces, such as gears, axles, pins, and beams. Some sets also come with pneumatic pieces orelectirc motors.
In recent years, technic pieces have begun filtering down into other Lego sets as well, the power miners, and others, but mostly notably the bionics sets (which were once sold as part of the Technic line), as well as a great many others.