Secondaryeducation is a period of education which follows directly after primaryeducation (such as intermediate school or elementary school), and which may be followed by tertiary or "post-secondary" education.
Primary and secondaryeducation together are sometimes (in particular, in Canada, Australia and the United States) referred to as "K-12" education, (K is for kindergarten, 12 is for twelfth grade).
Secondaryeducation is referred to by different names in different countries, see education by country.
Secondaryeducation is a period of education which, in most contemporary educational systems of the world, follows directly after primaryeducation, and which may be followed by tertiary, "post-secondary", or "higher" education (e.g., university).
In some educational systems, secondary schools are literally termed middle schools; the use of this term is not consistent around the world as middle school in some systems refers to the first period of secondary schooling, or alternately, the last period of primaryeducation.
The exact boundary between primary and secondaryeducation varies from country to country and even within them, but is generally around the seventh to the tenth year of education, with middle school covering any gaps.