Generator at power plant is operated by a mechanical sources such as steam turbine powered by oil, coal or nuclear energy. The turbine turns the generator which consists of metallic coil in a strong magnetic field, The speed of rotation determine the frequency (60Hz).
Wind generator produce AC but of different varying frequency. The electricity firstly will be convert to DC and then back to AC of the correct frequency before feeding to the electricity grid.
Car alternator is actually an AC generator. The alternator is turned by the engine via a belt. The AC current is converted to DC by diodes to charge the car battery.
Inverter produces AC from DC source.
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