The CLASS is a reference to any element on a page that needs to look a specific way when this reference is used. For example, if you frequently want to highlight a word or two within your text (we'll use red as a highlight color in this instance), you might have a CLASS selector in your style sheet like this:

.hilite { color: red}
and the reference in your HTML might look like this:
...this is some text about something
I want <span class="hilite">in red</span>. And 
some more rambling here...
As you can see, the difference between ID and CLASS selectors in the style sheet is that an ID uses a pound sign (#name) and a CLASS uses a period (.name) . ID references must be unique on a page and used once. CLASS references can be used repeatedly in the same page.

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