- Graphical representation of data is easier to understand.
- A bar graph, a pie chart and histogram are graphical representations of data.
- A line graph displays data that changes continuously over periods of time.
- A line graph in which all the line segments form a part of a single line is called a linear graph.
- For fixing a point on the graph sheet, we need two mutually perpendicular lines (in which horizontal line is called x axis and the vertical line as y axis) alongwith, x coordinate (abscissa) and y coordinate (ordinate) of the point.
- The process of fixing a point with the help of the coordinates is known as plotting a point in the plane.
- The relation between a dependent variable and an independent variable is shown through a graph.

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