In Chapter 6, we introduced the notion of events and how OpenLayers uses events. At the core, there are essentially two types of events used by OpenLayers: Browser events and Map events. Browser events are things like clicking on the map div with your mouse, while Map events are things such as zooming the map to some coordinate. We worked a little bit with events in Chapter 6, so let's extend that knowledge and add even more custom functionality to our map.