A three-phase system is a method of electrical power distribution that uses three alternating currents, which are offset in time by one-third of a cycle. This setup allows for a more efficient and stable power supply compared to single-phase systems. It is commonly used in industrial and commercial applications to power large motors and heavy machinery. In a three-phase system, the three currents can be delivered through either a delta or wye configuration. This design helps balance the load and reduces the amount of wiring needed, making it a cost-effective solution for transmitting electricity over long distances.