Every Forex trade involves the simultaneous buying of one currency and the selling of another currency. These two currencies are always referred to as the currency pair in a trade.
A currency is appreciating when it strengthens in price in response to market demand.
A Forex API is computer coding for integrating the trading programs to a broker's dealing platform. An API is most of the times used to allow a trading program to read a data feed.
Forex trading by means of an automated computer program. Algorithmic trading is also called 'program trading'.