The term "high school" refers to a level of education that typically takes place between 9th and 12th grade in the United States. It is an institution where students aged 14-18 years old receive their secondary education, preparing them for college or entering into the workforce after graduation. High schools offer various academic subjects such as math, science, history, literature, and languages, along with extracurricular activities like sports, music, drama, and clubs to provide a well-rounded educational experience.