What are the three types of roofs on stadiums?

The three main types of roofs on stadiums are retractable roofs, fixed roofs, and open-air designs. Retractable roofs can be opened or closed as needed, allowing for flexibility in weather conditions. Fixed roofs provide full coverage but are permanently closed, while open-air stadiums have no roof, exposing fans to the elements. Each design has its advantages, impacting the venue's usability and spectator experience.