The forex expert advisor is a program capable of performing in the terminal any action following the instructions of a trader, without his direct involvement. All tasks are performed automatically or mechanically, which is why the advisors are called experts or mechanical trading systems (MTS). Simply put, this is a program sending applications to a broker without any intervention on the part of the trader. You install a profit forex expert advisor to the existing forex online trading platform, which is connected to the server broker, adjust all the settings, and the advisor will begin trading according to a preset strategy.