One can think that an internship can be useless or only something for the CV, but here I'll explain what I did so you take that idea out of your mind.
First of all let me present the company where I did my internship for 6 months, it's called CSUC and the logo looks like this:
Nice, isn't it? Well it's nice actually, it's a company that works mainly for the Catalan Government (Generalitat de Catalunya), and therefore, they maintain and do all type of IT work that you can imagine.
Time to explain what I did there, not big projects as you can imagine but still some interesting stuff: