Speedcubing is a term meaning the activity of solving a Rubik's Cube as fast as possible. Speedcubing can be associated with many types of cubes. Usually only cubes that turn well because if it does not turn well the cuber could not solve it fast and would get frustrated. Example for cubes that turn fast the Moyu cubes ganz puzzle and maby a speed Rubiks brand cube.
Rubik speedcubing (thx pogobat!)
A good example of speedcubing.