What is the purpose of using serum?

[Vanilla]

I've noticed alot of ladies use one. I would like to try the one from the Keracare line, but I don't know how to use it or what to use it for. TIA

 

[Armyqt]

Keracare Silken Seal will be well worth your purchase. It smooths the cuticles and adds shine to the hair. Serums are best used on wet hair after applying a leave-in.

 

[BrEE]

most people use serums when they do rollersets or to get that shiny smooth look. and serums help a whole lot when detangling wet hair.

 

[karezone]

Yeah they do. But most are straight "cones", so you have to clarify more often.