der Student
student
A male person who is enrolled at a university or college in order to study an academic subject.
Mein Bruder ist Student an der Technischen Universität Berlin.
My brother is a student at the Technical University of Berlin.

student
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student
A male person who is enrolled at a university or college in order to study an academic subject.
Mein Bruder ist Student an der Technischen Universität Berlin.
My brother is a student at the Technical University of Berlin.

'Der Student' (the male student) is an N-declension noun. This means it takes the ending '-en' in all cases except the nominative singular.
Ich habe den neuen Studenten in der Bibliothek getroffen.
I met the new student in the library.
'Der Student' (the male student) belongs to the word family of 'studieren' (the verb, to study) and 'das Studium' (the process of studying). Someone who studies is a student.
Er studiert Medizin; er ist also Medizinstudent.
He studies medicine; so he is a medical student.
To say which university someone studies at, you use the preposition 'an' followed by the dative.
Sie ist Studentin an der Universität Heidelberg.
She is a student at the University of Heidelberg.
student / pupil
'der Schüler' and 'der Student' both refer to people who are learning. The important difference is the place and type of education. A Schüler attends a school, for example a primary school, Realschule, or Gymnasium. A Student is enrolled at a university or college. Learners often confuse the words because some languages use the same word for both. In German, you say 'Schüler' for children and teenagers at school, and 'Student' for people at university.

In der Bibliothek sucht der Student Bücher für seine Hausarbeit.
In the library, the student is looking for books for his term paper.
Der Schüler bereitet sich am Abend auf die Mathearbeit vor.
The student is studying in the evening for the math test.