Meine Schwester studiert an der Universität in Köln.
My sister studies at the university in Cologne.
Die Universität war gestern wegen des Streiks geschlossen.
The university was closed yesterday because of the strike.
Nächstes Jahr wechsle ich an eine andere Universität.
Next year I am switching to another university.
Note
The article is part of the word: die Universität. That way you learn the gender with it.
Remember die Universität for good. ripiti brings the word back just before you forget it, with these sentences. Free, no account needed, works offline.