EA is a technology based trading tool which is particularly suited to automated fast moving trading, characterized by both scalping and high-frequency trading (HFT) strategies.
Forex scalping involves trading currencies with only a brief holding time and executing multiple trades each day. Risk is kept small in an attempt to capture small price movements for a profit. These small price movements can become significant amounts of money with leverage and large position sizes.
High-frequency trading (HFT), is a type of rules based algorithmic trading characterized by high speeds, high turnover rates, and high order-to-trade ratios that leverage high-frequency financial data and electronic trading tools.
HFT typically makes money by taking advantage of small price differences between different markets or by arbitraging between different asset classes.