Transformers are electrical devices that transfer electrical energy between two or more circuits through electromagnetic induction. They are essential in adjusting voltage levels to ensure efficient power distribution in electrical systems. By stepping up or stepping down voltage, transformers help in minimizing energy loss during transmission. In everyday life, transformers are found in various applications, from power plants to household appliances. For instance, power transformers are used in electrical grids to manage high voltage electricity, while small transformers can be found in chargers for devices like smartphones and laptops.