The document discusses different types of graphs used to visualize data from experiments, including line graphs and bar graphs. Line graphs are used when the data shows a continuous trend over the independent variable. Bar graphs, or histograms, are used when the data is grouped rather than continuous. Some examples of experiments and how they could be graphed are provided, such as an experiment on how light color affects plant growth graphed with light color on the x-axis and plant height on the y-axis.