In finance, specifically in foreign exchange markets, a percentage in point or price interest point (pip) is a unit of change in an exchange rate of a currency pair.
The major currencies (except the Japanese yen) are traditionally priced to four decimal places, and a pip is one unit of the fourth decimal point: for dollar currencies this is to 1/100th of a cent. For the yen, a pip is one unit of the second decimal point, because the yen is much closer in value to one hundredth of other major currencies.
A pip is sometimes confused with the smallest unit of change in a quote, i.e. the tick size. Currency pairs are often quoted to four decimal places, but the tick size in a given market may be, for example, 0.5 pips or 1/2 pip.