With your TUM student ID card you are allowed use all services of the MVV network from 6 pm to 6 am during the week, and without time limits during the weekend and on public holidays. This service is included in the tuition fee you pay at the beginning of the semester.
The additional MVV semester ticket is the IsarCard Semester for students which allows you to take S-Bahn, subways, busses and certain trains in the MVV network without any time limitations.
Where and how to get it?
You can buy it at every MVV ticket vending machine. After choosing the university you belong to, you have to enter your student ID number. Always carry your student ID and the ticket together when taking the public transportation services and have fun exploring Munich and the places around whenever you want.