A Geographic Information System (GIS) is a technology that allows users to collect, analyze, and visualize spatial data. It combines maps with data to help understand relationships, patterns, and trends in various locations. GIS is widely used in fields like urban planning, environmental management, and transportation. GIS works by layering different types of information, such as satellite imagery, demographic data, and infrastructure maps. This layering helps users make informed decisions based on geographic context. By integrating various data sources, GIS can reveal insights that are not easily seen in traditional data formats.