In education, a credit is a unit representing successful completion of a course that counts toward graduation requirements or a credential. High school graduation typically requires accumulating a specified number of credits across required and elective subjects. Different courses may be worth different credit values based on instructional hours. Credits can be earned through regular classes, online courses, co-op education, and sometimes recognized prior learning. Post-secondary institutions also use credit systems, though structures vary. Understanding credit requirements helps students plan their education paths. Transferring credits between institutions or programs involves evaluation of whether previous learning meets current requirements.