The Euro is the official currency of 18 Eurozone countries. The currency is managed by the European Central Bank (ECB) based in Frankfurt in collaboration with the Eurosystem. Despite being a modern currency, it is already the second largest reserve currency and second most traded in the world. The Euro coins come in denominations of 1c, 2c, 5c, 10c, 20c, 50c, €1 and €2. Euro banknotes are available as €5, €10, €20, €50, €100, €200 and €500. All Euro coins have a common side which shows the amount and a map of Europe. On the reverse, each country has their own variation which represents their culture. Despite these differences, all Euro coins are valid in all Eurozone countries. The Euro banknotes are the same on both sides in all Eurozone countries. They were designed by an Austrian, Robert Kalina, and each denomination has its own color and represents a historic period of European architecture with windows and gates on the front and bridges on the reverse.
The Unidad de Fomento (UF) is a Unit of Account belonging to Chile. It does not have any coins or banknotes. Its value is related to the Chilean Peso and today (2014), the exchange rate fluctuates according to the rate of inflation. The Unidad de Fomento is used to price things like mortgages, loans, taxes, rent etc. Things priced in Unidad de Fomento will remain at a fixed Unidad de Fomento price but the exchange rate to Pesos will fluctuate. For example, if the rent of a house is 20UF a month, the actual amount paid in Pesos each month will vary according to the UF exchange rate from month to month.