when applying for a mortgage what does the underwriter do?

my wife and i are applying for a mortgage and couldnt get enough money for the house of our dreams.i had a friend cosign which made40,000 dollars from jan07 untl now. my broker said he had to take information to an underwriter what is an underwriter and why doe the mortgage process take so long?

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Tags: applying for a mortgage, cosign, doe, dreams, enough money, what is an underwriter