Online marketers have taken to pay-per-click (PPC), and many use it, but apparently not everyone understands it very well.

Although online marketers have been investing in PPC search marketing for a number of years, a new survey of marketers — all of whom have been using PPC for at least two years — conducted by the e-tailing group found that managing PPC programs poses a challenge.

The fact that marketers use PPC was clear from the survey. In fact, with 44% of e-commerce executives surveyed saying they allocate 20% of their entire advertising budgets to PPC search ads, it constitutes a significant portion of online marketing budgets.

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