"Third-class" typically refers to a category of service or accommodation that is less expensive and offers fewer amenities compared to first-class and second-class options. This term is often used in contexts like travel, where third-class tickets on trains or buses provide basic seating and limited services, making them accessible to budget-conscious travelers. In historical contexts, "third-class" can also denote a social class, often associated with lower economic status. For example, during the French Revolution, the Third Estate represented commoners who sought greater representation and rights, contrasting with the privileged classes of nobility and clergy.