Alternating Current (AC) is a type of electrical current that periodically reverses direction. Unlike Direct Current (DC), where the flow of electricity is constant and unidirectional, AC changes its voltage and direction over time. This makes AC suitable for powering homes and businesses, as it can be easily transformed to different voltages for efficient transmission over long distances. AC is generated by devices such as generators and is commonly used in household appliances, lighting, and industrial equipment. The standard frequency of AC in many countries is 60 Hz or 50 Hz, indicating how many times the current changes direction per second.