The General Educational Development, or GED, is a series of tests that measure high school-level knowledge and skills. It is designed for individuals who did not complete their high school education but wish to earn a credential equivalent to a high school diploma. The GED covers four main subjects: Mathematical Reasoning, Reasoning Through Language Arts, Science, and Social Studies. Passing the GED tests can open up opportunities for further education, job training, and improved employment prospects. Many colleges and employers recognize the GED as a valid alternative to a traditional high school diploma, making it an important option for adult learners.