Histogram was first used by Karl Pearson and It is a tool which helps to understand the data points and its distribution among different groups.
In layman language, this charts divides the data into multiple range groups with same interval i.e. 1-5, 5-10… and then plot the data into these groups to find the distribution among these group. So that you may understand, what are the major areas which has large impact or your major data fall. This helps the user to understand the nature of your data.
Histogram is different from bar chart as bar charts works with two data variables however Histogram works with one data variables (numeric). The intervals/groups used in this graphs are called bins/buckets and this bins are created with same interval or width. These bins are consecutive and non overlapping intervals.
This Histogram will look like as below: