A visual aid is a tool used to help people understand information more easily. It can be in the form of a CHART, MAP, GRAPH, or even a seeing-eye dog. A CHART is a graphical representation of data, usually in the form of a table or diagram. A MAP is a two-dimensional representation of a geographical area, showing features such as roads, rivers, and cities. A GRAPH is a diagram that shows the relationship between two or more variables. Finally, a seeing-eye dog is a specially trained dog that helps blind people navigate their environment.