A graph, or chart, is a visual representation of data that helps to illustrate relationships, trends, or comparisons. Common types of graphs include bar graphs, line graphs, and pie charts, each serving different purposes. For example, a bar graph can show the differences in quantities, while a line graph is useful for displaying changes over time. Graphs are widely used in various fields, including science, business, and education, to simplify complex information. By presenting data visually, graphs make it easier for people to understand patterns and draw conclusions quickly, enhancing communication and decision-making.