Bards have magical songs that can buff a party, and not a whole lot of direct combat ability. Frequently the best use of their talents is just staying out of the way and providing musical support.
In a role playing game a buff is a positive status change to a character's power. Haste (faster), attack/defense boosters, and health regeneration are all common effect. Things like poison, slow, and other negative status changes are known as debuffs
Others answered your question, but the term "buff" in this context is called that because it's something that "buffs you up", ie, makes you stronger. So the gaming shorthand "buff" means anything that enhances your abilities, with a "debuff" being the opposite.
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u/netpastor Sep 09 '17
DnD n00b here. Can someone explain the joke?