What is the difference between the editions of Photoshop CS6 extended?

What is the difference between the normal version of Adobe Photoshop CS6 extended and the student and teacher edition? Is it a limited warranty or less functions? Or is it the price As an extension - I am a student so is it just cheaper for students? ---- Extra question: What is the purpose of Adobe Lightroom? show more What is the difference between the normal version of Adobe Photoshop CS6 extended and the student and teacher edition? Is it a limited warranty or less functions? Or is it the price

As an extension - I am a student so is it just cheaper for students?

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Extra question: What is the purpose of Adobe Lightroom?
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