A reward is a gift or thank you for contributing towards a project! Projects are not required to offer a reward - however it does make projects feel fun to support! Rewards can come in all sorts of forms, both physical and digital. Rewards can look like a thank you card or video, it can look like a credit of your name in a movie, it can be an item of value or something sentimental - the coolest part about rewards is that they are as unique as the project!!
Rewards can also sometimes take time - often times a delivered date of a reward can be month (or years) in the future. If you are wanting to contribute because you are interested in the reward - be sure to check the estimated delivery date. Keep in mind these are still estimates, but if you have any specific questions on a project, be sure to message the project leader.