Fifth-Class refers to a classification system used in various contexts, such as education or postal services. In education, it typically denotes a grade level for students around 10 to 11 years old, often corresponding to the fifth year of formal schooling. In postal services, Fifth-Class mail is a category for bulk or standard mail that is not time-sensitive, often used for advertisements or promotional materials. This classification allows for cost-effective mailing options, making it accessible for businesses to reach a larger audience without high expenses.