1. Transverse waves: These waves oscillate perpendicular to the direction of wave propagation. Think of a wave on a string, where the string moves up and down while the wave travels horizontally. Examples include:

* Light waves

* Electromagnetic waves

* Waves on a string

* Seismic S-waves

2. Longitudinal waves: These waves oscillate parallel to the direction of wave propagation. Imagine compressing a spring, creating a region of high density followed by a region of low density. This compression and rarefaction propagates along the spring. Examples include:

* Sound waves

* Seismic P-waves

* Waves in a spring

Let me know if you'd like more details on these wave types!