Transformers are essential devices in electrical power systems, enabling efficient voltage conversion for generation, transmission, and distribution. This article explores the core functions and distinctions among various transformer types: Distribution Transformers, power transformers, 3-phase transformers, and furnace transformers. Each type plays a vital role, from supplying homes and industries to powering heavy machinery. Understanding their differences helps optimize energy use, enhance reliability, and support infrastructure across residential, commercial, and industrial sectors.