What do we mean by secondary education?

Answer for Questions & Answers for the future of Secondary Education in 2020

In most contemporary educational systems of the world, secondary education is a stage of formal education characterized by transition from the typically compulsory, comprehensive primary education for minors to the optional, selective tertiary, "post-secondary", or "higher" education (e.g., university, vocational school) for adults. Depending on the system, schools for this period or a part of it may be called secondary schools, high schools, gymnasiums, lyceums, middle schools, colleges, vocational schools and preparatory schools, and the exact meaning of any of these varies between the systems.

The exact boundary between primary and secondary education varies from country to country and even within them, but is generally around the seventh to the tenth year of education. Secondary education occurs mainly during the teenage years.

The purpose of secondary education can be to give common knowledge, to prepare for either higher education or vocational education, or to train directly to a profession.