Indoor Positioning System (IPS) is used to locate objects or people inside buildings using various sensory technologies like lights, radio waves, magnetic fields or acoustic signals. It works by using small beacon devices that send signals at regular intervals, which nearby phones or devices can receive to calculate their distance from the beacon and determine their indoor position. Some common uses of IPS include tracking assets in hospitals, guiding visitors at trade shows or malls, and monitoring equipment in manufacturing facilities. GPS does not work well indoors due to walls blocking signals.