The word college students is general and can cover many objects. Undergraduates are more formal and single-minded;
College students: The word college students is very colloquial. Generally speaking, college students refer to students studying in undergraduate colleges, including undergraduates, master students and doctoral students.
However, with the increasing popularity of college students, people will also include college students in their daily expressions. That is to say, students who complete high school and continue their studies can all be called college students ~
Undergraduate course: the term undergraduate course is more specific, and undergraduate course is a specific term. Therefore, undergraduates generally refer to students who are studying undergraduate courses.
Undergraduate students seldom use it because it is too formal and official. College students have simple names and high fault tolerance rate, and everyone prefers to use them ~