QGIS is an open-source geographic information system (GIS) that allows users to create, edit, visualize, and analyze spatial data. It supports various file formats and integrates with other software, making it a versatile tool for mapping and spatial analysis. With a user-friendly interface, QGIS is suitable for both beginners and experienced users. It offers a range of features, including layer management, data editing, and advanced analysis tools, enabling users to work on projects related to urban planning, environmental studies, and more.