Slow Falling

Slow Falling causes the affected mob to fall slower and also completely stops all fall damage, but does not prevent ender pearl damage in 1.13.

Mechanics
If the player is in the air while having this effect, they will fall down at a much slower rate. When the player hits the ground, they will not take any fall damage. Also, if any type of entity jumps on a crop with this effect, there is no chance of the crops breaking and dropping as an item.

Immune mobs
No mobs are immune to Slow Falling. Its effects may not show on certain mobs such as shulkers however, making them functionally immune.