AC motors are probably the most common motors inside your dwelling. They are used in fans, vacuums, kitchen appliances such as mixers and blenders, as well as drills. saws and grinders.
Most automobiles use a reverse electric motor called an alternator to generate AC current that is rectified through diodes to produce DC current to operate the ignition, lights, servo-motors and accessories and to recharge the battery.
AC motors are usually cheaper to make and maintain, and are much more common where AC power is available.
There is information on AC motors and their operation here: