Whats the difference between visits and impressions ?

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November 9, 2012, 2:00 am

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Whats the difference between visits and impressions ?

I had recently stumbled upon some sellers who were selling banners on their sites based on monthly impressions and monthly visits ...

Whats the major difference between the two to assemble them in different categories ???

I dont find any but I see it exists ...

Any help ?