Forex expert advisor or forex robot is a very sophisticated forex software tool for trading on the Forex Market. They are constructed based on a strict set of rules and parameters and they are designed to easily fit into your trading platform to execute your trades automaticaly.
Majority of Forex EA can be automated while others are only to be used at your own discretion. It is up to you how you wish to use them and profit from their distinct features.
Many traders fail on the Forex Market because they give into their emotions while trading, and make wrong decisions based on your fear, greed or to chase losses.
The expert advisor has a fixed trading plan, and because it is a trading like a robot it will stick to its plan no matter what, without being influenced by outside factors like emotions, stresses, fatique or in other words the robot trade fully disciplined.