Definition of hand history
A hand history is often a text file saved on your computer. In this text file is written the history of an online poker hand that you played. Most online poker rooms store hand histories. These files record every detail of a poker hand played. There are hand histories for all game variations (tournaments, sit'n'go, cash games, Omaha, Hold'em, etc). These files are used by your tracker to give you information about the players. The tracker will read all the recorded hands, accumulate the information and display it on the table in your HUD.
Hand history, an incredible study tool
If you want to improve your game, it will be necessary to study your poker. To do this, there are several options. Reviewing hand histories is a great way to improve. Not only can we take notes on our opponents (we have much more time to notice all the details of an opponent's style), but we can also review the mistakes we've made. One thing that is really important when reviewing hand histories with your tracker is to take notes.