Three-phase refers to a type of electrical power system that uses three alternating currents, each set 120 degrees apart in phase. This configuration allows for a more efficient and stable power supply, commonly used in industrial and commercial applications. It can deliver more power with less conductor material compared to single-phase systems. In a three-phase system, the three currents can be combined in various ways to create different voltage levels. This versatility makes it ideal for running large motors and heavy machinery, as it provides a continuous and balanced power flow. Commonly, transformers and generators are designed to work with three-phase systems to optimize energy distribution.