A graph is usually a drawing or a chart, which shows the relationship between changing things. People also refer graph as a diagram showing the relationship between amounts or numbers. Usual graphs make use of lines, bars, or parts of a circle to show the data.

In other words, a graph represents facts in an apparent manner. It is a kind of diagram, which shows the comparative size of statistical quantities. Hence, a graph is termed the simplest method to compare numbers.

You can use graphs to show several types of data, because they are not just restricted to the simpler types as such circle, bar, and line graphs. You can liberally use graphs to make facts more apparent and logical.

**Importance of Graphs to have a Clear Idea:**

Graphs are undoubtedly a handy way to depict your data in an apparent manner. You just need to make sure the way to display your results with correct graph form. You can take advice from your respective math teacher too.

The x and y axes on bar and line graphs ought to be correctly labeled with appropriate units of measure. You can use metric units to label these axes. The line, bar, and circle graph depicts different types of data and below mentioned is a general description of these graphs:

**Bar Graph:**

You can use bar graphs to display the relationship among groups. Any two items that you will be comparing need not necessarily influence each other in any way. It is also a quickest way to display huge difference.

**Line Graph:**

You can use line graphs to depict continuing data, for how one thing is influenced by the other. You can clearly see how things are progressing by the fluctuations shown in line graph. Such types of graphs are necessary to display the consequence of independent variables on dependent variables. For example, pulse rate of a person is clearly viewable in a line graph. Since, the time continues and the pulse rate keeps on changing.

**Circle or (Pie) Graph:**

A pie graph or circle graph will help you to display a part of something that relates to the whole. Usually, circle graphs are a key way to show percentages efficiently.

Points to be Remember:

Below mentioned are certain reminders, which you need to carry in mind while working on graphs:

1. First, try to perform all the measurements perfectly and constantly with the use of metrics, wherever applicable.

2. Try to make diagrams or sketch of different forms of your project, and try to take photographs too.

3. Do not to get dispirited, work attentively and try to repeat the project, if necessary.

4. Try to organize measurements and observations in charts or tables in a clearly labeled manner.

5. Finally, keep a daily record sheet or log book to keep track of problems, modifications, measurements, and calculations of graphs over time.

**Area Graph:**

You can use area graphs to display things, which change over time. These graphs have an x-axis (horizontal) and a y-axis (vertical). Generally, the x-axis denotes the time scale, whereas the y-axis denotes what you are measuring.

You can use area graphs specifically, when you think to plot data that has ups (peaks) and downs (valleys) or for data collected over a short period.

One real example of area graph would be the graph required to show percentage of high school graduates, who have completed advanced English courses over a period.

Some graphs are easy to understand, while some are a bit complicated. You have to be a bit careful while you work on graphs, as there are several types of graphs with each one having moderate and definite use.