A strategy is not a plan.
A plan is usually a list of steps taken to accomplish a goal. A plan tackles questions like how, when, where, who, and what? A plan is a good thing to have. In fact, it is vital to the success of almost any effort. However, developing a plan should not be the first step in addressing a task.
A strategy is bigger than a plan. Strategy tackles the question of why? It has a large scope and looks at the end result as well as the many paths to the desired outcome. A strategy looks at every possible influencing factor, both seen and unforeseen.