Question

what called a wave? what's its definition​

Answer 1

In physics, a wave is a disturbance that transfers energy through matter or space, with little or no associated mass transport (Mass transfer). Waves consist of oscillations or vibrations of a physical medium or a field, around relatively fixed locations. From the perspective of mathematics, waves, as functions of time and space, are a class of signals.[1]

Answer 2

Waves are most commonly caused by wind.Wind-driven waves, or surfacewaves, are created by the friction between wind and surface water. As wind blows across the surface of the ocean or a lake, the continual disturbance creates a wave crest. ... These very long waves are calledtsunamis.