Online interactive GIS mapping is crucial for planning because it allows planners to integrate, visualize, and analyze diverse spatial data in real time. It supports informed decision-making by showing complex relationships between different factors like land use, population density, infrastructure, and environmental constraints on multi-layered maps. This enhances resource allocation, zoning, infrastructure management, and community engagement. Moreover, interactive GIS promotes collaboration among stakeholders regardless of location, making planning more transparent, efficient, and responsive to changing needs. Overall, it enables smarter, data-driven urban development and sustainable resource management