Secondary education refers to the second stage of traditional education that comes after primary education. The age range for the start of secondary education is 11-13, and it ends around 15-18. These age limits can change from one nation to the other. In most countries, secondary education is marked compulsory. 

Moreover, secondary education is divided into lower secondary education and upper secondary education in some countries, whereas some countries simply use the term secondary education. Secondary education is one of the crucial phases in the formal education system since it delivers education for the younger generation. Secondary education promotes life skills and focuses on areas like literary-philosophical studies, economics, social sciences, mathematics, physical sciences, earth sciences, biological sciences, and scientific and industrial technology. The terminology that is used for secondary education is different from one country to the other. Upper schools, gymnasium, high schools, lyceums, middle schools, and vocational schools are some of them.