Scaling is when a weapons Base Damage is increased by a certain percentage depending on its letter (i.e. E - S). So say you have a weapon with a Base Damage of 260 and an S-Scaling in either Strengh, Dexterity, Intelligence or Faith, this means that your weapon has the potential of getting between 364 and 520 (140 - 200%) bonus damage before resistances and absorption. What Raw infusion does is removing the Scaling (i.e. bonus Damage), but make the weapon have higher Base Damage so you don't have to invest in, say, Str or Dex if you're a Sorcerer, for example. Hope this helps.