Maps are a key tool used by geographers to identify regions and analyze their content. There are different types of maps that serve various purposes and distort representations of locations, distances, sizes, and directions to different degrees depending on their projections. Reference maps show absolute locations and are used for navigation, while thematic maps show relative locations and tell stories about distributions of attributes. Key aspects of maps include their scale, projections, grid system, symbols, and how they can show bias depending on their purpose and construction.