The result of calling this function is another instance of the jQuery object that
wraps the underlying DOM elements that matched the selector. Because it returns
another jQuery instance, you can continue to chain calls to jQuery methods that in
turn allow you to perform complex operations on DOM elements in a very succinct
manner. The preceding example calls the addClass method, which adds the specified
CSS class to each element contained in the wrapped set (in this example, all of the
1 elements in the page).
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