A voltage spike is a sudden increase in electrical voltage that can occur in a circuit. This rapid surge can happen due to various reasons, such as lightning strikes, power surges, or the switching of electrical devices. Voltage spikes can last for a very short time, often just a few microseconds, but they can cause significant damage to electronic components and systems. To protect against voltage spikes, devices like surge protectors and voltage regulators are commonly used. These devices help to absorb or limit the excess voltage, ensuring that sensitive equipment, such as computers and home appliances, remain safe from potential harm.