OpenStreetMap
OpenStreetMap (OSM) is a collaborative, open-source mapping platform that provides free, editable geographic data of the world. It allows users to create, modify, and share map data under an open license, similar to Wikipedia for maps. The platform includes tools for data collection, editing, and access through APIs and downloadable datasets.
Developers should learn OpenStreetMap when building location-based applications, GIS systems, or services requiring custom or up-to-date map data, as it offers a free alternative to proprietary mapping services like Google Maps. It is particularly useful for projects in regions with limited commercial map coverage, humanitarian efforts, or applications needing detailed, community-driven data such as pedestrian paths or local points of interest.