A wave is a transmission of a disturbance from one place, the source to another.
Waves can be classified as mechanical waves or electromagnetic waves depending on the requirement of a material medium.
<em><u>Mechanical waves </u></em><em><u>are those waves that require a material medium for transmission, they include, sound waves, water waves, etc. The transmission of these waves is by vibration of particles in the medium.</u></em>
<em><u>Electromagnetic waves</u></em><em><u> are those waves that do not require a material medium for transmission.They include, radio waves, microwaves, and all the waves in the electromagnetic spectrum.</u></em>