bar chart/bar graph
It uses vertical bars, based on the values entered in as data. See the image at the link below.
A bar graph is a visual display formed by lines or bars across a scaled grid. The relative lengths of the bars (horizontal or vertical) indicates the values represented.
It's called a Bar Graph. Excel and othe software can create them for you with info you supply.
they are called error bars. It represents the amount of error associated with each data point
A bar graph
display
Spreadsheet packages may chart one set of data in the form of a pie chart, or two or more sets of data in bar charts (with vertical bars, horizontal bars, or stacked bars), line charts, area charts, or mixed charts, which combine bars and lines
On a bar graph, the y-axis is the vertical axis, typically located to the left of the data bars.
line graph
If the intervals are of different width, then it is a histogram.
Yes, without them you can't display the data correctly. A graph has a horizontal and vertical axis.