A diagram is a visual representation that illustrates information, concepts, or relationships between different elements. It often uses shapes, lines, and symbols to convey ideas clearly and concisely. Diagrams are commonly used in various fields, including science, education, and engineering, to simplify complex information and enhance understanding. There are many types of diagrams, such as flowcharts, bar graphs, and Venn diagrams. Each type serves a specific purpose, like showing processes, comparing data, or illustrating relationships. Diagrams can be created by hand or with software tools, making them accessible for both professionals and students.