Tiers refer to levels or layers within a system, often used to categorize or rank items based on specific criteria. For example, in a subscription service, there may be different tiers that offer varying features and benefits, such as basic, premium, and deluxe options. Each tier typically has its own price point and set of services. In other contexts, such as education or gaming, tiers can represent different stages of achievement or difficulty. For instance, students may progress through tiers of learning, while gamers might face increasing challenges as they advance through tiers of levels. This structure helps organize and enhance experiences.