One method of storing data is assigning codes to it, usually means shortening the original data. this is used to increase the efficiency of your system.
Example 1 • Monday, Tuesday, Wednesday, Thursday • Mon, Tues, Wed, Thurs, Fri
Example 2 • Xtra Large, Large, Medium, Small • XL, L, M, S
Further examples • Country names- Great Britain – GB Airline flight codes- British airways flight from Heathrow to Oslo BA688 Police codes Kidnapping-207 Assult-240
Post Codes and Number Plates • Post codes are coded data • NG11 0JT