Difference between a CLASS and ID

What is the difference between a CLASS and ID?
Computer GuyAsked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
A 'class' is intended to be used wherever necessary while an 'id' is supposed to be unique.  'id' is also used by javascript to identify/find elements and get and set the values of them.
David KrollCommented:
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