There are three main types of graphic aids that are commonly used in presentations: graphs, charts, and diagrams. Each has its own strengths and weaknesses, so it's important to choose the right one for the data you have and the message you want to convey.
Graphs are a good way to show how something changes over time, or how it relates to other things. For example, you could use a line graph to show how a company's sales have grown over the past year.
Charts are a good way to compare different things, or to show how something is broken down into smaller parts. For example, you could use a pie chart to show what percentage of a company's sales come from each of its products.
Diagrams are a good way to show how something works, or to show the relationships between different things. For example, you could use a Venn diagram to show how two groups of people overlap.