What is data entry experience?

Here is a definition from the Department of Labor:

Data entry keyers usually input lists of items, numbers, or other data into computers or complete forms that appear on a computer screen. They also may manipulate existing data, edit current information, or proofread new entries into a database for accuracy. Some examples of data sources include customers' personal information, medical records, and membership lists. Usually, this information is used internally by a company and may be reformatted before other departments or customers use it.

http://www.bls.gov/oco/ocos155.htm#nature