write simple defintoons for each not long

bar graph
line graph
pie chart
x-axis
y-axis

- A bar graph is a graphical representation of data using bars of varying heights or lengths to show the comparison between different categories.

- A line graph is a graphical representation of data using lines to connect data points, often used to show trends or changes over time.

- A pie chart is a circular chart divided into slices to represent data proportions, with each slice representing a different category.

- The x-axis is the horizontal line on a graph that represents the independent variable or data categories being measured.

- The y-axis is the vertical line on a graph that represents the dependent variable or data values being measured.