What is the difference between line graphs and bar graphs?

one is a line and the other one are bars

^^^that is a silly answer.

^^^^that is a funny answer!

the real answer is that line graphs are better at demonstrating something when both of your quantities or units involved are NUMBERS while graphs work better when one is Words. for example, a bar graph would be good for "how much money you make per week" because the week side would be Words however, "how much money you make per HOUR" would be good as a line graph because hours are also numbers. Hope that helps!
A line bar shows the different amounts between things. A circle graph shows the percentages of things.