The Team / Family Discounts tab is where you can set a discount based on a set criteria.

eg. When a team of 10 registers they get a 10% discount.
In this scenario, if a team of 9 register, they do not get a discount. If a group of 10 registers they do get a discount.

eg. When a family of 4 registers
If you use variable pricing for families, you may want to apply a family discount for certain family entries e.g. 2 Adults and 2 Children, then applies a $10 discount.