Informal applicaton letter?!

0Hi everybody,02br
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00My name is Ina and I have a little problem, which, I hope we can solve together:)02br
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00I want to apply to one university for my Master studies, and I am preparing my documents right now. However, I am a little bit confused, because they want from me an informal application letter and separately two pages of my study motivations.02br
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00Does somebody know what should this informal letter include? I mean, it is clear that the most important part is this with my motivations, so....I need help!02br
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00Thanks a lot!0-