This document provides an overview of OpenStreetMap (OSM), a collaborative project to create a free editable map of the world. It discusses the history and growth of OSM from 2014-2015, lists various online resources about OSM including tutorials and articles, and outlines the main types of map features mapped in OSM such as buildings, land use, amenities, and transportation. It also shares examples of applications that utilize OSM data and provides links to OSM communities on sites like Wikipedia, GitHub and Facebook.