[SandsharkPolar]

Gerry, I stand corrected.
Action refers to how much the rod deflects or bends when you put pressure on the tip. A fast action rod will bend in only the top 3rd or less of the blank, a medium or moderate action will bend in the top half or so and a slow action will bend starting in the lower 3rd of the rod. Fast action rods are great for short to long casting distances and where single hooks are the rule, such as jig fishing. Medium action fishing rods provide a little more casting distance and still offer good responsiveness for setting your hook. The medium fast rod will handle heavier jig weights better than a medium rod.