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Probably more than 90% of products require a voltage regulator of some kind, making them one of the most commonly used electrical components.
Voltage regulators can be divided into two broad classifications: Step-down: Outputs a voltage lower than the input voltage Step-up: Outputs a voltage greater than the input voltage Knowing your input and output voltages will help you to easily decide which group your regulator falls under.
Voltage regulators that require an output voltage less than the input voltage are the most common type of voltage regulator. For example, you input 5 V and it outputs 3.3 V, or you input 12 V and it outputs 5 V.