A chart or graphic representation is a type of representation of data, usually numerical, by means of visual resources (lines, vectors, surfaces or symbols), so that the mathematical relationship or statistical correlation between them is visually manifested.
<em>Charts are used to show the relationship between two factors</em>.
When making presentations, chart is a good tool to compare two or more factors. Using this kind of visual aid helps you to expose in a clear way any comparison. You need to determine what kind of chart is the best option. You have to take into consideration elements such as the number of variables to show in the chart and the number of items to be displayed in the chart. Line charts are good for trends. Bar charts are good for comparisons.
