Counting cards is one of the most used strategies in playrooms. This technique appeared in the 1980s in the United States and developed over time. Black Jack players consider it a pretty difficult technique to practice because it requires a lot of concentration and good visual acuity. These qualities that you must develop are essential, because they will not only allow you to have a good sense of observation, but also to evaluate the cards. In this part we will first define what card counting is and then analyze together the different forms of card counting and their specificities.