a collection of medium powered rods
a medium or moderate action will bend in the top half of the rod.
Medium and medium-fast rods will usually provide a little more casting distance and still provide adequate hooksetting power. These actions are often used for applications that involve treble hooks, such as crankbaits and topwater lures or other reaction baits such as spinnerbaits. The type of lure you use will usually determine the action of the rod you should use.
Power ratings are usually describes as heavy, medium heavy, medium, etc. Power is closely related to the line strength; heavier power rods will handle heavy line weights and lighter powers will be good for light lines. It is fairly important to keep your line test within the limits printed on the rod since a heavy power rod will snap light lines too easily and heavy lines can snap a light rod.