AC (Alternating current) is an electric system in which the voltage is continuous and alternating with a fixed frequency. Due to this, AC electricity is not lost even when transmitted over long distances through a conductor cable, and it is easy to transform voltage by a transformer. So, it’s used for transmitting high-voltage electricity from a power plant to another area. Also used for supplies to the machine, which needs high electric power.
DC (Direct current) is an electric system in which current will flow one-way from a high-voltage node to a low-voltage node. Due to the fact that DC voltage is easy to use, it is usually used with small electric circuits.