A reward is something that you are given, for example because you have behaved well, worked hard, or provided a service to the community.

A reward is a sum of money offered to anyone who can give information about lost or stolen property or about someone who is wanted by the police.

If you do something and are rewarded with a particular benefit, you receive that benefit as a result of doing that thing.

The rewards of something are the benefits that you receive as a result of doing or having that thing.

If you say that something rewards your attention or effort, you mean that it is worth spending time or effort on it.