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<id> or <class>?

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if i want to use id or class connected with a css file (for example .menu or #menu) to define the background of a menu in a <div>, would i use id or class? can someone tell me in general when to use id and when to use class? does it matter? thanks
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ID is used when there is a single instance used in the file as opposed to class being used when there are multiple instances used.

It does matter.

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