Secondary education refers to the stage of formal education that follows primary education and precedes higher education. It is typically offered to students between the ages of 14 and 18, although the specific age range may vary depending on the educational system and country. The purpose of secondary education is to provide students with a well-rounded education that prepares them for higher education or the workforce.

In the International Standard Classification of Education scale, secondary education covers two phases: lower secondary education (also known as junior secondary education) and upper secondary education (also known as senior secondary education). Lower secondary education is considered the second and final phase of basic education, and upper secondary education is the stage before tertiary education.

The educational focus in upper secondary education is varied according to the students interests and future direction, and education at this level is usually voluntary. Upper secondary education is likely to show these criteria:

• Entry after some 9 years of basic education
• Typical age at entry is between 14 and 16
• Completion of lower secondary education is usually required

In summary, higher secondary education refers to the final stage of formal education for students typically aged 16-18, preparing for tertiary/adult education or providing skills relevant to employment, usually with an increased range of subject options and streams.