There are 2 types of waves mechanical and electromagnetic, mechanical waves need a medium to travel energy, while an electromagnetic wave doesn’t not require a medium. Electromagnetic waves travel through the vacuum(space). Electromagnetic waves include : radio waves, microwaves, infrared radiation, visible light, Ultraviolet light ( UV light), x-rays, and gamma rays, all of those are transverse waves. Mechanical waves are separated into 2 waves longitudinal and transverse. Transverse waves travel up and down while longitudinal waves travel back-and-forth