For recording information using numbers.
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Numeric data are numbers (like age, cost, etc.), while non-numeric data are not numbers (like name, address, etc.).
Yes, a chart can be used to display numerical data.
A chart is sometimes referred to as a graph and is a picture of numeric data.
Numeric means a number is used. For a key, that would usually be an integer. Non-numeric keys can include any symbols (i.e., text). In theory, you could also use other specialized data types, for example, dates. Check the data types available by a specific RDBMS; details may vary. Almost any data type can be used for a key; although variable-length data types such as BLOB are either not supported or not practical to use.