Letters / internship application letter (student in computer science) [2]

hello!
i am happy that i found this website.

I am a graduate student in computer science and I Am looking for internship in an organisation and they want me to explain how usefull and what i will gain from this internship (the reson why i wat to join so bad) hence this organisation train young employees who does not have experience so that they can meet companies requirements.

I was wondering if you could help me with an impressive cover latter.
thanks guys, hope to hear from all of you.