Forex robots might be a new entrant onto the scene for retail investors and traders, but investment and trading banks have been profiting from this sort of trade for many years. Robots or "expert advisers" are simply automated trading systems. Turn the computer on and with little training, the user can become a proficient trader of financial markets. In this specialized world, this sort of style is called "black box" trading and this is the kind of strategy employed by many of the world's largest and most successful banks and hedge funds.
Expert advisers crunch the numbers on many trading algorithms in different markets at super fast speed, generally on the lookout for repeatable price signals. The major benefit of this high power searching is that as the robot can both find and act on the signal itself. The price moves that the robot hunts out are generally smaller and shorter-term, much shorter than your average swing trader would be on the hunt for. This allows the to take small price movements out of the market (profits) quickly, ensuring that small but regular profits are made.
The generally uses some form of overbought / oversold indicator to generate its trade signals. It then acts on them quickly, quite often closing the trade when the momentum of the move wanes even slightly. This ensures that the trader is always on the same side as the anticipating short-term momentum of the market.
The most interesting thing is…