Chim-chimney, chim-chimney, chim-chim cher-ee
Those are three words that don't make sense to me
But I'm used to words that don't make sense to me
From all those commercials I see on TV

—Allan Sherman, in his parody of "Chim-Chim-Cher-ee"

An Advertising Campaign is a series of ads, all for the same product or business, which have a unifying theme, cast of characters, or plot. Some ad campaigns come and go and no one really remembers them once they're gone. Then there are the ones that are used for a long time, are extremely effective, or are particularly memorable. Usually, this means that they are working really well.