Definition of add-on
When we talk about an add-on in poker, we are talking about tournament poker. It is an addition that you can make to your stack at a specific point in the tournament, often at the first or second break. This add-on is never free and depends on the tournament, but its price is often equal to the entry fee. It is important not to confuse it with a rebuy, which is a mat that can be purchased when you have lost all your chips. The add-on can be made at the same price for all players, no matter how many chips you have.
Example of an add-on
We are in a €10 tournament which gives us 1500 chips. After a few hands we are all in and lose all our chips. The dealer then asks us if we want to make a rebuy. For €10, we get the same number of chips as we started with, 1500. With this rebuy, we are lucky and increase our stack to 50,000 chips. At the break, we have the option of doing an add-on for $10. From this point on, we have to consider whether this add-on will be profitable for us. If the add-on is 1500 chips for 10 euros, considering our stack, it is not a good option. However, if the add-on is 20,000 chips, it will be imperative to take it.