An award chart is a graphical representation of an airline's frequent flyer program, which shows the number and type of miles required to earn various awards such as free flights or upgrades. The chart outlines the different levels of rewards that can be earned based on how many miles are accumulated through flying with the airline or by participating in other activities offered by the program. It serves as a guide for passengers to understand what they need to do to earn each type of award and helps them plan their travel accordingly.