The term buff can mean either of the following:
- As a noun, a positive effect.
- As a verb, to increase power or provide a positive effect.
"Buff" can be used to refer to either in game effects or changes to game mechanics. For example, Windborne Speed is a buff because it increases movement speed while the change to Meteor in the August 25, 2005 update was a buff because it decreased the energy cost, making the skill relatively more powerful.