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JavaScript: Why shell anonymous functions?

Very often, for libraries / functions / snippets, Javascript is encapsulated by an anonymous function, e.g.

(function () { // code to be executed goes here })();

As far as I can tell, this should be completely redundant: this anonymous function simply executes the code inside. However, obviously, the reason for this !:-)

I saw the appearance of this with a comment next to the first line: //// wrapper for Opera.

Does anyone know why this code is commonly used, what is the history of its development and what is its relationship with Opera?

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