ESD and computers?

I just read about ESD and now i'm worried about my computer. is it only necessary to wear these bracelets when you're touching the inside components of your computer, or are you also supposed to wear them when you're just using your computer, or listening to music on itunes, or things like... show more I just read about ESD and now i'm worried about my computer. is it only necessary to wear these bracelets when you're touching the inside components of your computer, or are you also supposed to wear them when you're just using your computer, or listening to music on itunes, or things like that?

BTW, what is ESD and when are you supposed to be worried about it?
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