Charts are used to visually represent data. There are many styles of charts one could use. Pie charts, histograms, tables, bar and line graphs, are all ways that one could present data. A T-chart typically has two columns. They can each have a heading with numbers below to represent quantities relevant to the heading. For example, one could have a T chart with the heading, Days in one column and Height in the other column. This T chart could be used to record data from a growth experiment on a plant for a certain number of days and the measurements obtained for the height of the plant each day. One could then use the T chart as a data table and eventually use the data to produce a graph. Generally, people should be able to extract the meaning of a chart with very little text, based on the headings in the chart and the data found therein.