Wind turbines use blades to collect the wind's kinetic energy. Wind flows over the blades creating lift (similar to the effect on airplane wings), which causes the blades to turn.
Turbines convert the energy from a gas or liquid into power by converting a working fluid's kinetic energy in the form of velocity, and potential energy in the form of pressure, into rotating kinetic energy through multiple turbine blades attached to a shaft.
The number of blades in the rotor and the number of vanes in the stator are often two different prime numbers in order to reduce the harmonics and maximize the blade-passing frequency.