How is wind turned into electricity?

Wind is converted into electricity by using a wind turbine or, more specifically, a generator. 

Wind is generated due to the uneven heating of Earth's atmosphere, irregularities of surface, etc. When wind blows, its molecules have kinetic energy. This kinetic energy is used to turn the blades of a turbine. This rotational motion of the blades turns the shaft of a generator, which produces electricity.

A modern wind turbine consists of blades, generator, a support structure, etc. These are deployed in windy regions and can generate a large amount of electricity, depending on their size and wind velocity, etc. The wind turbines can be horizontal-axis turbines or vertical-axis turbines. Most of the turbines we commonly see are of the former variety. 

Wind turbines are typically installed in large numbers in a given region, thus forming a wind farm.

Hope this helps.