The 
Collision POP lets you specify how the particles will react once they collide with the surface. You can make them die, bounce, stop, stick, or slide on collision, as well as continue on course.
The 
Creep POP lets you manually stick particles to a surface at explicit UV coordinates as well as slide them along the surface.
The 
Limit POP is very similar to the Collision POP, but instead of detecting collisions with geometry, it detects particles “colliding” with an imaginary boundary, either a box or a sphere.
The 
Soft Limit POP is like the Limit POP, but gives softer bounces.
Using Collision
Click the
Collision button on the Drive Particles tab of the shelf.
Click
the particle system you want to be affected and press Enter to confirm your selection.
Click
the object you want the particles to affect and press Enter to confirm your selection.
Choose how the particles will react in the Behavior drop-down menu on the Behavior tab of the parameter editor.
For specific parameter help see the Collision node help.
Using Creep
Click the
Creep button on the Drive Particles tab of the shelf.
Click
the particle system you want to be affected and press Enter to confirm your selection.
Click
the object you want the particles to stick to or slide along and press Enter to confirm your selection.
Choose how the particles will react in the Behavior drop-down menu in the parameter editor.
For specific parameter help see the Creep node help.