Students is the plural of student."There are 5 students."Students' is the possessive form of students."I graded the students' tests."
The difference between a ant and a student is that students have education and ants don't. Ants are small but students are big.
One has an American passport and the other has an English passport
A university is much bigger and has a collection of colleges.
A college/school that is not a university that grants a 2-year degree such as an Associate's degree. An example of a college that's not a university is a Community College or Junior College such as...