A student is a person enrolled in a school or other educational institution.
A teacher, also called a schoolteacher or formally an educator, is a person who helps students to acquire knowledge, competence, or virtue, via the practice of teaching.
A university (from Latin universitas 'a whole') is an institution of higher (or tertiary) education and research which awards academic degrees in several academic disciplines. University is derived from the Latin phrase universitas magistrorum et scholarium, which roughly means "community of teachers and scholars". Universities typically offer both undergraduate and postgraduate programs.