Forex trading robots make up one of the main types of automated trading software currently available to personal forex traders. Popular commercial forex trading robots include FAP Turbo and Forex Megadroid, among hundreds of others currently available for download online. Most of them install quickly and run as Expert Advisors on the popular MetaTrader 4 trading platform. One of the things to watch out for with forex trading robots is that their vendors often provide profitability numbers based on back-tested trading results over periods for which the robots are optimized to perform well. This means that future trading results might differ substantially, and usually do.