A U.S. high school diploma is an official document awarded to students who successfully complete their secondary education, typically after four years of study. It signifies that a student has met the required academic standards set by their state and school district. The diploma is often a prerequisite for further education, such as attending a college or university, or for entering the workforce. To earn a high school diploma, students must complete a specific number of courses in subjects like math, science, English, and social studies. Additionally, many states require students to pass standardized tests to demonstrate their knowledge and skills before graduation.