In short, Ethereum is similar to the blockchain version of Android and iOS systems, a blockchain APP platform. Ethereum is a global open source platform for decentralized applications (DApp). The name comes from Ether and the suffix ruem (Greek meaning is "oil")
Since it was introduced to the world in 2008, blockchain has become an increasingly popular buzzword among businesses across a wide range of industries.
Dash is a cryptocurrency that has been in use since 2014. It was originally named "Darkcoin", but was renamed to Dash in 2015, and is ranked 10th in market capitalization and is highly popular.
What is foreign exchange? In a narrow sense, foreign exchange originally refers to foreign currency. In a broad sense, it usually refers to the means of payment for international settlement expressed in foreign currency. Exchange rate is also called "foreign exchange market or exchange rate".