Mechanical waves are the type of waves that involve the oscillation of matter. They require a material medium for propagation and thus, transfer most of their energy through this medium. While these waves cover very large distances, the movement of the medium, on the other hand, is very limited and is sometimes almost immobile. Thus, the medium of propagation hardly seems to move from its initial position of equilibrium. Mechanical waves carry bundles of energy as they move. The direction of this energy is in the direction of wave propagation. Mechanical waves can only be produced and propagated along media that have inertia and elasticity. In contrast to this, electromagnetic waves do not need any medium for propagation and can even travel in a vacuum.