Question

A wave which needs a medium (solid, liquid, gas) in order to propagate itself.

Answer 1

Any 'mechanical' wave needs a medium in order to travel from one place to another.

Examples of mechanical waves include . . .

-- ocean waves

-- sound waves

-- Slinky waves

-- guitar-string waves

-- hand waves

-- curtain waves

-- ripples on a pond

-- seismic waves (earthquakes)