Incentives are meant to motivate people to put more effort into the work they have been assigned to do.
It can come in several forms including;
Indirectly - these are incentives that do not directly impact a person but might spur them to work harder e.g donating food to a charity of their choice if they reach a certain target
Direct incentives affect the person directly.
Negative - these incentives are like punishments or threats thereof that work by reducing an unwanted behavior for example, reducing pay for late coming
Positive - these incentives involve rewarding a person for a job well done so that they can do more for example, bonuses for working hard.