This document discusses the history and applications of geolocation technology. It provides background on GPS and how geolocation has evolved from use in car navigation systems to integration with smartphones and social media. Examples are given of early geolocation apps like Brightkite and Foursquare and how geolocation allows information about physical locations to be shared and viewed through augmented reality. Suggestions are also made for how real estate agents can use geolocation to promote listings and connect with clients.