You can exchange Budapest currency for US currency at most banks that exchange foreign currency. You can also make this exchange at places like currency kiosks at international airports.

You can exchange them at the Currency Exchange.

Go to "Catalog" and then click "Trade Currency"

I think 'forex exchange' comes from the term 'foreign currency exchange'. You can exchange your money from the currency of the country you are based in to a currency from another country.

The currency in Bolivia is Boliviano and the foreign exchange code of the currency is BOB.

Currency exchange is the process by which travellers can obtain currency by exchanging notes and coins from their country of origin for the local currency of their destination.