Why does Viola assume the disguise of Cesario in Twelfth Night?

So I've just finished the play for a class and I still don't understand why Viola disguises herself as Cesario in the first place. Is it just to get a job from a wealthy employer? I don't understand what makes her decide to at all. As far as I can tell, she personally is not under any scrutiny so I'm very confused.

Update:

I should say this isn't any kind of homework question so to speak. I'm writing an essay on the play and while I can make points based on other parts of the plot, I feel like this is something I need to know.

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