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Isn't a wrapper div a little redundant, you already have the body tag for that.
Shahetul ChistyFront End Web Development Techdegree Graduate 21,589 Points
I’ve found a wrapper useful when I want to target everything except for the nav. Such as creating space on each side of the content, but having the nav stretched across.
Samantha AtkinsonFront End Web Development Techdegree Student 34,914 Points
The cool thing about wrappers is that you can give your body selector a background that will cover the entire browser, no matter the size. Then with the wrapper, you could have a totally different background, like an image going on for your content and nicely center your content in the center of a browser no matter the width of the browser/viewport. A wrapper doesn't have to just wrap all content, it can be a wrapper for certain elements too.