PPR you get a set amount of points for each catch...
in a full point PPR = 1 point for each catch.
.5 ppr = .5 point for each catch
So their is emphasis put on receivers that catch the ball alot, rather than just TD and yard production.
And there is more emphasis put on dual threat running backs because of the points. So players like McCaffrey will really be effected if it is ppr or non-ppr.