A school is an institution
An institution is any structure or mechanism of social order and cooperation governing the behavior of a set of individuals within a given human community...

 designed for the teaching of student
A student is a learner, or someone who attends an educational institution. In some nations, the English term is reserved for those who attend university, while a schoolchild under the age of eighteen is called a pupil in English...

s (or "pupils") under the direction of teacher
A teacher or schoolteacher is a person who provides education for pupils and students . The role of teacher is often formal and ongoing, carried out at a school or other place of formal education. In many countries, a person who wishes to become a teacher must first obtain specified professional...

s. Most countries have systems of formal education
Education in its broadest, general sense is the means through which the aims and habits of a group of people lives on from one generation to the next. Generally, it occurs through any experience that has a formative effect on the way one thinks, feels, or acts...

, which is commonly compulsory
Compulsory education
Compulsory education refers to a period of education that is required of all persons.-Antiquity to Medieval Era:Although Plato's The Republic is credited with having popularized the concept of compulsory education in Western intellectual thought, every parent in Judea since Moses's Covenant with...

. In these systems, students progress through a series of schools. The names for these schools vary by country (discussed in the Regional section below), but generally include primary school for young children and secondary school
Secondary school
Secondary school is a term used to describe an educational institution where the final stage of schooling, known as secondary education and usually compulsory up to a specified age, takes place...

 for teenagers who have completed primary education.