Primary education generally refers to children's education from kindergarten to primary school, mainly for children aged 3 to 6. Preschool education refers to the early education and enlightenment education provided to children before they enter regular primary schools, aiming at cultivating their basic skills, social skills and interest in learning.
Higher education refers to the learning stage after secondary education, including undergraduate and postgraduate education. The main goal of higher education is to provide in-depth subject knowledge and professional training, and prepare students for entering a specific career field or engaging in advanced research.
Therefore, preschool education belongs to primary education, and higher education refers to undergraduate and postgraduate education. The two are different in educational level and goal.