Your PPC campaign structure has an impact on everything you do, particularly in Adwords. Employing a solid, intuitive campaign structure is the best ammunition you have for achieving a high quality score. It also helps when analyzing your PPC results categorically - whether you decide to do this at the campaign or ad group level (or, ideally, both).
So, let's take a step back and review the elements of a PPC account. This is pretty much standard on all three engines. Your account structure contains four key elements.
Notice that I put the keywords and ad copy on one line, because they are both located at the same hierarchical level. We call them "ad groups" because we're tying a group of keywords to one or more ads.
If we're going to turn the above into something meaningful, it might look something like this:
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