The most immediate use for a surge protector is that it lets you keep more than one device plugged in at the same time. But equally important, it protects your most precious, and often expensive equipment from electrical surges. Surges are an increase in the voltage above the designated level of electricity. The power company, lightning, or an internal electrical surge is usually the cause.
Internal electrical surges happen when a power hungry device such as a refrigerator is plugged in. The instant demand for power disrupts electricity flow. This can overload and damage your equipment. In other words, too much electricity may cause your wires to burn.
How does a surge protector shield you from this? A surge protector maintains the designated amount of voltage in the flow of electricity by rerouting any extra electricity to a grounding wire. This is the wire inside the surge protector that connects directly to the grounding prong, that is, the only round prong of the three on your plug. The grounding prong sends all extra electricity to ground, literally.
These days a surge protector is always a good investment. Modern devices such as computers are made up of sensitive components like microprocessors that are easily damaged by even small surges of electricity. If damaged, these devices can be expensive to replace, and in the case of computers, important information may be lost.