What is transverse wave motion. Give examples

If the particles of a medium vibrate in a direction normal to the direction of propagation of wave, the motion is called transverse wave motion, e.g., stretched strings of violin, guitar, sitar, sonometer etc. Electro-magnetic waves are also transverse in nature.

Crests and troughs are formed when a transverse wave propagates. Distance between consecutive troughs or creats is called wavelength