De facto currency
A de facto currency is a unit of money that is not legal tender in a country but is treated as such by most of the populace. The United States dollar and the euro are the most common de facto currencies.
Euro
Andorra used the euro unofficially prior to June 2013, at which point the euro became its official currency. The euro remains the de facto currency in Kosovo and Montenegro.United States dollar
Countries using the United States dollar as their de facto currency include Aruba and Cambodia, where most hotels, restaurants, and transportation are priced in dollars;Dominican Republic where it is acceptable in many places, including airports to pay temporary visa fees for non-US/Dominican visits; Iraq, where United States commercial, governmental and military involvement due to the Iraq War and the Iraqi Dinar's low value has made the US dollar highly preferred; Timor-Leste, Lebanon, El Salvador, Ecuador, and Panama; Venezuela where they accept the USD for practically everything as a substitute for the highly inflated Venezuelan bolívar. In Zimbabwe the United States Dollar is used as the accepted currency for almost everything. Wages are paid partly in USD and the other half in ZiG. The majority of the population prefer the USD than the ZiG. The adoption of the USD was the result of the collapse of the Zimbabwean Dollar in 2008-2009. The Zimbabwean Government has tried to introduce new currencies but the USD remains the legal tender in every financial transactions from central across all sectors