a. Vibration of particles

Requires a medium for transfer.
Mechanical wave
Examples: sound, water waves, and spring waves
Vibrations and disturbances that transfer energy through matter or space

Video Instruction
showmethephysics.com
I. Introduction to Waves

Sound, water waves, light, microwaves, and heat rays

1. Waves transfer energy from one place to another with no transfer of mass.
2. Waves can be produced in two ways:

Requires a medium for transfer.
Mechanical wave
Examples: sound, water waves, and spring waves

Small changes in the strength of an electromagnetic field require no medium for transfer.
Electromagnetic wave
Examples: light, microwaves, and X-rays

ERPI Classroom Films, Inc. · Encyclopedia Britannica · Public domain

Splash of a Water Drop
N. Carolina School of Science and Mathematics
3D Electromagnetic Wave #1 — David M. Harrison
3D Electromagnetic Wave #2 — David M. Harrison
Biswajeet — India