A Digital Elevation Model (DEM) is a 3D representation of a terrain's surface created from terrain elevation data. It provides a digital map of the Earth's surface, showing variations in height and landforms. DEMs are commonly used in geographic information systems (GIS) for applications like land use planning, flood modeling, and environmental studies. DEMs can be generated from various sources, including satellite imagery, aerial surveys, and ground-based measurements. They are essential for analyzing topography, understanding watershed dynamics, and supporting infrastructure development. By visualizing elevation changes, DEMs help researchers and planners make informed decisions about land management and conservation.