The "2-7" card counting system is a simplified method where you assign values to cards as they are dealt. Cards 2 through 6 are given a +1 value, while 7 is neutral (0), and cards 8, 9, 10, face cards, and aces are assigned a -1 value. As you keep track of the running count, a positive count suggests that more high cards (which favor the player) are left in the deck, so you should increase your bet. A negative or neutral count indicates more low cards are left, which favors the dealer, so you would bet conservatively. While this system is easier to learn than more complex methods, it provides less precision but still offers a basic edge over the house when used effectively.