A high school is the name used in some parts of the world, particularly in North America, to describe an institution which provides all or part of secondary education. The precise stage of schooling provided by a high school differs from country to country, and may vary within the same jurisdiction. Though they may go by different names, most countries around the world have schools that are similar in philosophy to high schools. In most parts of the world it is the last stage of compulsory schooling, and prepares a student to continue on to higher education, such as a college, university, or vocational schooling. Graduation from high school is considered a significant rite of passage in many cultures, particularly the United States.

In addition to completing this level of academic studies, high schools offer adolescents support in making the transition from childhood to adulthood in social, career, and other interests through extra-curricular activities as well as purely academic studies. High schools face serious challenges in fulfilling these goals, both academically and socially. In many cases the social environment of high schools is far from ideal, with the result that many students fail to achieve their potential and leave without graduating. Nevertheless, the establishment of high schools and the availability of this level of education to all students is beneficial to society.