The Practicum module is what makes the degree you are studying a professional degree. A professional degree qualifies you to work in a certain profession. This means that not just anyone can be a teacher. You need to acquire both the knowledge and skills necessary for the profession before becoming a qualified teacher. Doctors or surgeons would not be allowed to operate on someone without having practised and received their licence. Lawyers would not be allowed to prosecute or defend someone without having studied, practised, and received their professional licence. In the same way, teachers need to first study and practise their craft before beginning their teaching career as a qualified teacher.