Preschool in the context of "Parallel play"

A school is the educational institution (and, in the case of in-person learning, the building) designed to provide learning environments for the teaching of students, usually under the direction of teachers. Most countries have systems of formal education, which is sometimes compulsory. In these systems, students progress through a series of schools that can be built and operated by both government and private organization. The names for these schools vary by country (discussed in the Regional terms section below) but generally include primary school for young children and secondary school for teenagers who have completed primary education. An institution where higher education is taught is commonly called a university college or university.

In addition to these core schools, students in a given country may also attend schools before and after primary (elementary in the U.S.) and secondary (middle school in the U.S.) education. Kindergarten or preschool provide some schooling to very young children (typically ages 3–5). University, vocational school, college, or seminary may be available after secondary school. A school may be dedicated to one particular field, such as a school of economics or dance. Alternative schools may provide nontraditional curriculum and methods.

Early childhood education (ECE), also known as nursery education, is a branch of education theory that relates to the teaching of children (formally and informally) from birth up to the age of eight. Traditionally, this is up to the equivalent of third grade. ECE is described as an important period in child development.

ECE emerged as a field of study during the Enlightenment, particularly in European countries with high literacy rates. It continued to grow through the nineteenth century as universal primary education became a norm in the Western world. In recent years, early childhood education has become a prevalent public policy issue, as funding for preschool and pre-K is debated by municipal, state, and federal lawmakers. Governing entities are also debating the central focus of early childhood education with debate on developmental appropriate play versus strong academic preparation curriculum in reading, writing, and math. The global priority placed on early childhood education is underscored with targets of the United Nations Sustainable Development Goal 4. As of 2023, however, "only around 4 in 10 children aged 3 and 4 attend early childhood education" around the world. Furthermore, levels of participation vary widely by region with, "around 2 in 3 children in Latin American and the Caribbean attending ECE compared to just under half of children in South Asia and only 1 in 4 in sub-Saharan Africa".

Primary education is the first stage of formal education, coming after preschool/kindergarten and before secondary education. Primary education takes place in primary schools, elementary schools, or first schools and middle schools, depending on the location. Hence, in the United Kingdom and some other countries, the term primary is used instead of elementary.

There is no commonly agreed on duration of primary education, but often three to six years of elementary school, and in some countries (like the US) the first seven to nine years are considered primary education.

A primary school (in Ireland, India, the United Kingdom, Australia, New Zealand, Trinidad and Tobago, Jamaica, South Africa, and Singapore), elementary school, or grade school (in North America and the Philippines) is a school for primary education of children who are 4 to 10 years of age (and in many cases, 11 years of age). Primary schooling follows preschool and precedes secondary schooling.

The International Standard Classification of Education considers primary education as a single phase where programmes are typically designed to provide fundamental skills in reading, writing, and mathematics and to establish a solid foundation for learning. This is ISCED Level 1: Primary education or first stage of basic education.

Kindergarten is a preschool educational approach based on playing, singing, practical activities such as drawing, and social interaction as part of the transition from home to school. Such institutions were originally made in the late 18th century in Germany and Alsace to serve children whose parents both worked outside home. The term was coined by German pedagogue Friedrich Fröbel, whose approach globally influenced early-years education. Today, the term is used in many countries to describe a variety of educational institutions and learning spaces for children ranging from two to six years of age, based on a variety of teaching methods.

Stages of play is a theory and classification of children's participation in play developed by Mildred Parten Newhall in her 1929 dissertation. Parten observed American preschool age (ages 2 to 5) children at free play (defined as anything unrelated to survival, production or profit).

Parten recognized six different types of play:

Pre-kindergarten (also called pre-K or PK) is a voluntary classroom-based preschool program for children below the age of five in the United States, Canada, Turkey and Greece (when kindergarten starts). It may be delivered through a preschool or within a reception year in elementary school. Pre-kindergartens play an important role in early childhood education. They have existed in the US since 1922, normally run by private organizations. The U.S. Head Start program, the country's first federally funded pre-kindergarten program, was founded in 1967. This attempts to prepare children (especially disadvantaged children) to succeed in school.

Pre-kindergartens differentiate themselves from other child care by equally focusing on building a child's social development, physical development, emotional development, and cognitive development. They commonly follow a set of organization-created teaching standards in shaping curriculum and instructional activities and goals. The term "preschool" more accurately approximates the name "pre-kindergarten", for both focus on harvesting the same four child development areas in subject-directed fashion. The term "preschool" often refers to such schools that are owned and operated as private or parochial schools. Pre-kindergartens refer to such school classrooms that function within a public school under the supervision of a public school administrator and funded completely by state or federally allocated funds, and private donations.