In an organized internship you can apply and deepen your learned knowledge in a variety of fields.
Since the internship is a mandatory component of your studies, the internship offers you the opportunity to gain practice at a public institution: for example a ministry, a trade association, or a NGO. Many of these organizations only take mandatory internships. This gives you an advantage, when applying.
The internship can be done during the longer semester break in the Summer. Since many interesting positions can only be acheived in advance, you should start looking at internships by the beginning of your second semester.