In this blog, we are going to learn about graphs and different types of graphs. Let's begin.

Do you know what graphs are?

A graph is a visual, concise means of presenting the information. Graphs are the visual representations of data. Data can be in the form of a table but graphical representation is easier to understand.

Data can be in the form of a table but graphical representation is easier to understand. With the graphs, we can easily compare the data.

Price of Wheat in five years

Year	Price (In Rs.)
1999	12
2000	15
2001	18
2002	20
2003	14

Bar Graph

A Bar graph is a chart with rectangular bars with lengths proportional to the values that they represent. The bars can be plotted vertically or horizontally.

Different Types of Graphs:

A bar graph consists of two or more vertical or horizontal bars.

The height of each bar shows the weight of students of a particular height. For example, the weight of a student whose height is 150 centimeters is forty-two kilograms.

Double Bar Graphs

Bar graphs can also have double bars.  We can use this graph to compare the marks of Raghav and Alisha in a particular term. In this graph, each term has two bars, one representing the marks of Raghav and the other representing the marks of Alisha.

We can call it the double bar graph. In the third term, Raghav got forty-five marks and whereas Alisha got thirty-five marks.

Let's move on to other different types of graphs.

Histogram

Let us look at this graph, this is a histogram.  A Histogram is a bar graph that shows data in intervals. It has adjacent bars over intervals. This histogram shows the result of the maths text. Each bar represents an interval.  There are no gaps between bars because there are no gaps between intervals.

We know a histogram is also a bar graph but there is a difference between the bar graphs and histograms.

The difference in the way that bar graphs and histograms are drawn is that the bars in bar graphs are usually separated whereas in histograms the bars are adjacent to each other. However, This is not always true. Sometimes you see bar graphs with no spaces between the bars but histograms are never drawn with spaces between the bars. 

Pie Graph

Now the turn of pie graphs. 

This pie graph shows the votes of BJP, Congress, and others as the percentage of the total number of votes in the election. The area of each sector shows the percentage of votes of each political party. As we can see, the pie graph is used to compare parts of a whole.

Line graph

Now let us come to the line graph.

A line graph represents data or sets of data that have been collected over a period of time.
Line graphs compare two variables. Each variable is plotted along an axis. A line graph has a vertical axis and a horizontal axis. To the left is a table that shows the date in one column and the corresponding temperature in the second column.

Date	Temperature
1	10
2	25
3	30
4	42
5	23
6	25
7	40

The line graph below shows the degrees of temperature going up the vertical axis and the days of the week on the horizontal axis (going sideways from left to right). The points for the temperature of each day are connected by a line - thus the graph is a line graph.

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