Paddle

A kayak paddle. The colors are used for signal purposes by guides. (a) top view, (b) axial view
The Duvensee paddle, one of the world's oldest wooden paddle (Mesolithic around 6.200 B.C.)

A paddle is a tool used for pushing against liquids, either for propulsion in a boat or for mixing liquids.

Paddles commonly used in canoes consist of a wooden, fibreglass or metal rod (the shaft) with a handle on one end and a rigid sheet (the blade) on the other end. Paddles for use in kayaks are longer, with a blade on each end, and usually no handles.