Data means facts. Data consists numbers, letters, symbols and transactions.
Data is often easier to understand if it presented in the form of graph or diagram.
The information for a graph or diagram is often given in a frequency table.
A frequency table gives the name of each category of data, (list of items) and the number of items.
A pictogram uses symbols to represent data. A pictogram must have a key, which shows how many items of data each symbol represents.