Graveyard

From DwarfFortressWiki

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The graveyard stockpile is used to store corpses and severed limbs awaiting burial. Dwarves and their pets who die will be hauled to the graveyard, other creatures are treated as garbage and will be hauled to a refuse stockpile which accepts corpses.

To bury dwarves so that their friends and relatives don't get unhappy thoughts about "a loved one being left to rot", first build a Coffin b-n then set it to be used for burial q-b.

You can also create a personal Tomb from a built Coffin q-r and assign it to a specific dwarf. Other dwarves will be buried in any coffin that accepts citizens.

In practice, a graveyard is more like a morgue. It's temporary storage for dead dwarves, while a proper coffin is being built and placed.