A three-way light switch is a type of electrical switch that allows for the control of a single light fixture from two different locations. This is commonly used in hallways, stairwells, and other areas where it is convenient to have multiple control points for a single light.
Three-way switches are more complex than standard single-pole switches, as they require the use of a special type of switch and wiring configuration. However, they are relatively easy to install and can be a valuable addition to any home.