What does a diffuser do?  I usually let my hair air dry, and it
turns out okay-ish. I'm thinking about getting one but I don't
want my hair to look poofy.  2 Answers   A lot of curlies
diffuse their hair til it's about 75% dry then let it air dry
the rest of the way. I really like this method for my curls. 
Diffsers diffuse the air flow, meaning they increase the area
that the air is coming from, softening the air flow and allowing
you to dry curly hair without causing too much frizz. The narrow
nozzle on a hair dryer causes and strong stream of air to push
and blow around the hair, which becomes unable to control
without a brush.  Answer this question  Please to add your
answer.