Why do i need bonjour and what does it acctually do

This may sound like a stupid question but why do I need bonjour. It seems to sit there eating up processing power and not doing much. If I want to update I will get a message from my mate saying there is an update for ... you may want to update.
This leads me onto what bonjour actually does (apart from eat my process power and spare ram) and do I need it to be running at any time?

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Why do i need bonjour and what does it acctually do

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