Stadium seating level, also known as TIER, is a term used to describe the different levels of seating in a stadium. It is typically used to refer to the different levels of seating in a stadium, such as the lower, middle, and upper levels. Each level has its own set of advantages and disadvantages, such as better views or more expensive tickets. The TIER system is designed to provide a variety of seating options for fans, allowing them to choose the best option for their budget and preferences.