Education at the second level (levels 2 and 3) based on at least four years of previous instruction at the first level and providing general or specialized instruction or both, such as middle school, secondary school, high school, teacher training school at this level and vocational or technical school.
is a period of education which, in most contemporary educational systems of the world, follows directly after primary education, and which may be followed by tertiary, "post-secondary", or " higher" education (e.g., university). In Australia and other countries secondary schools is the official term for institutions offering this period of education. In other parts of the English-speaking world, secondary school is often used synonymously with secondary education.
In most contemporary educational systems of the world, secondary education is a stage of formal education characterised 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.