The concept of 学期 is central to understanding the structure of education in China. The Chinese academic calendar is highly standardized across the country, much more so than in many Western nations. Most schools, from primary level to university, operate on a two-semester system.
This contrasts with the more varied systems in the West, where universities might use semesters, quarters, or trimesters. In China, the word 学期 almost exclusively implies this two-part division of the academic year (学年). This national rhythm creates a shared experience for students nationwide, with everyone preparing for mid-terms (期中) and finals (期末) around the same time. The breaks between semesters, the Winter (寒假) and Summer (暑假) vacations, are major events in the national calendar, impacting travel, family life, and business.
学期 is a neutral, universally understood term used in all educational contexts. It's used to discuss schedules, plan studies, and describe periods of time related to school.