A graph is a visual representation of data that shows the relationship between different variables. It typically consists of two axes: the horizontal axis (x-axis) and the vertical axis (y-axis). Points on the graph represent data values, and lines or curves can connect these points to illustrate trends or patterns. Graphs come in various types, including bar graphs, line graphs, and pie charts, each serving different purposes. They are commonly used in fields like mathematics, science, and business to simplify complex information and make it easier to understand at a glance.