This document discusses how geographic information systems (GIS) can be used to analyze, visualize, and share spatial data and information. It provides examples of using GIS tools like Google Earth, Google Maps, and Bing Maps to view maps and satellite images, compare locations over time, analyze data layers, conduct fieldwork and surveys, and share information through digital maps, photos, and augmented reality. The document emphasizes that GIS allows for analyzing and sharing information in new ways that were not possible before through combining maps with other data types and real-time resources. It presents GIS as a valuable tool for teaching and research.