OpenStreetMap is a collaborative project to create a free editable map of the world. It allows users to add and edit mapping elements like points of interest, roads, and boundaries. The document outlines OpenStreetMap's copyright policy and describes tools like JOSM, OSMAnd, and Potlatch that allow offline and online editing of map elements and features on desktop and mobile. It encourages participants to sign up, navigate to Hanoi in Vietnam, make small edits by adding missing information, and save changes to the collaborative map.