The Work-Energy Theorem for Rotation states that the work done by a net torque on a rigid body is equal to the change in its rotational kinetic energy: $W=\int \tau d\theta =\Delta K_{rot}=\frac{1}{2}I{\omega }_f^2-\frac{1}{2}I{\omega }_i^2$ This is the rotational equivalent of $W=Fd=\Delta K_{trans}$.