F2L, or "First Two Layers," is a method used in solving the Rubik's Cube. It focuses on completing the first two layers of the cube simultaneously, rather than solving the first layer and then the second layer separately. This technique improves efficiency and reduces the number of moves needed to solve the cube. In F2L, the solver pairs up corner and edge pieces and inserts them into their correct positions. This approach allows for a more streamlined solving process, making it a popular choice among speedcubers who aim to solve the cube quickly and effectively.