A voltage divider is a simple electrical circuit that reduces a higher voltage to a lower voltage. It typically consists of two resistors connected in series. The output voltage is taken from the junction between the two resistors, allowing for a specific fraction of the input voltage to be used in a circuit. Voltage dividers are commonly used in various applications, such as adjusting signal levels, biasing transistors, and interfacing sensors. They are essential in electronics, helping to ensure that components receive the appropriate voltage for optimal performance. Understanding voltage dividers is fundamental for anyone working with electrical circuits or electronic devices.