OpenLayers
OpenLayers is an open-source JavaScript library for displaying interactive maps and geospatial data in web applications. It supports a wide range of map sources, including OpenStreetMap, Bing Maps, and custom tile services, and provides tools for vector layers, overlays, and user interactions like panning and zooming. It is commonly used for building GIS (Geographic Information System) applications, data visualization dashboards, and location-based services.
Developers should learn OpenLayers when creating web-based mapping applications that require high customization, support for multiple data sources, or advanced geospatial features like vector rendering and coordinate transformations. It is ideal for projects involving real-time data overlays, complex map interactions, or integration with proprietary GIS systems, as it offers more flexibility and control compared to simpler mapping APIs.