Illustration of Strategy
There are, of course, as many types of "strategy" as their are types of "creative." There are an equal number of definitions. Not all, however, are correct. In fact, for both strategy and creative, the majority of definitions are incorrect.
If you want a good illustration of a correct definition of strategy, read this.
It just so happens that it's also a brilliant piece on how to do effective marketing strategy under the guise of media planning.