Geolocation is bandied about quite a bit when discussing aspects of online marketing with location-specific components, but many are blurry as to how it works and how it’s being used, so I thought it’d be helpful to outline the basics of it, and to highlight some of the recent developments brought via the expansion of wifi and mobile device use that have improved its precision. Geolocation is coming into broader and broader usage in enhancing the user experience for local search and mobile applications, and it has quietly become a vital component to the policing of fraud—particularly for credit card validation and filtering of PPC advertising clicks.