A school semester is a specific period during the academic year when students attend classes and complete coursework. Typically, a school year is divided into two main semesters: the fall semester and the spring semester. Each semester usually lasts around 15 to 18 weeks, allowing students to learn various subjects and earn grades. At the end of each semester, students often take final exams to assess their understanding of the material. Some schools also offer a summer semester for additional courses, allowing students to catch up or get ahead in their studies.