This document defines money and discusses its evolution. It provides three common definitions of money: descriptive, legal, and general acceptability. Money is defined as anything generally accepted as payment. Wealth includes physical and financial assets without a time component, while income is the output from wealth over a specific period. The stages of money's development included commodity money in barter systems, metallic coinage, paper currency, credit/bank money in the form of checks, and now electronic banking transfers using cards.