I don't use robots in Forex trading and I also don't like it. The best way to get to know the concept of Expert Advisor is to try one on a demo account. However, EAs known as Expert Advisors are a set of instructions or programs to carry out their duties set by the trader after all Expert Advisors are robots in the form of software for forex trading automatically using the MT4 terminal (you will get an M4 terminal at the time of register).