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A graph is a pictorial representation of data in an organized manner. Graphs are usually formed from various data points, which represent the relationship between two or more things.

A picture says a thousand words, they say. A graph, on the other hand, not only says a thousand words but also tells a million stories. 

Each point, stroke, color, or shape on a graph has a different meaning that helps in interpreting a graph. They are of different types and vary in structure, with some having just points, others have points joined together by lines, and so on.