What is witty (Examples)?

Dipsy
They often say that being witty is good (with flirting), but what's it exactly (I'm not from an English speaking country). I've looked it up, but didn't get a good explanation.

So: what is witty? And do you have any examples (2 would be good) of a witty joke? And being witty is good right?
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What is witty (Examples)?
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