Bankroll is just a slightly grand word for the money you have set aside to play with. It sounds like something only high rollers need, but it is the single most useful idea for anyone who spins a slot, because the people who get hurt by gambling are almost never hurt by the games themselves. They are hurt by playing with money that was never meant to be at risk. A simple bankroll plan is the difference between entertainment you can afford and a habit that quietly eats into the rest of your life.