This is algorithm that uses a series of mesurements observed over time, containing statistical noise.
This is a very useful tool to filter different various numbers.

Can be very helpful to use for:
- VR. As far as not all devices provide precise data - this filter can avoid most of the problems.
- Smooth inaccuracy sensor values. Gyroscope, Accelerometer... They often can "show" pikes or unexpected values. This filter can help to hide those issues.
- More smooth joysticks movement
- Head movement
- Floating objects/menus. Can be used for objects, which follow something. Like menu, which slowly follows your head in VR.

Does not depend on Unity version.