Question

What do you mean by a wave?
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Answer 1

Waves are oscillations accompanied by a transfer of energy that travel through space or mass.

Answer 2

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$\color{violet}\huge\bold\star\underline\mathcal{WAVE}\star$ :- wave is a Disturbance (oscillation) that passes through a medium, at a speed determined by the properties of the medium.

❇THERE ARE TWO MAIN TYPES OF WAVES:-

$\color{violet}\huge\bold\star\underline\mathcal{mechanical wave}\star$ :- Mechanical waves propagate through a physical matter, whose substance is being deformed. Restoring forces then reverse the deformation. For example, sound waves propagate via air molecules colliding with their neighbours. When the molecules collide, they also bounce away from each other (a restoring force). This keeps the molecules from continuing to travel in the direction of the wave. 

$\color{violet}\huge\bold\star\underline\mathcal{electromegnetic wave}\star$:- Electromagnetic wave do not require a medium. Instead, they consist of periodic oscillations of electrical and magnetic fields originally generated by charged particles, and can therefore travel through a vacuum. These types vary in wavelength, and include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-raysand gamma rays.

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