The mass per unit volume is termed as density.It gives us the idea that how dense a substance is. The SI unit of density is kg/m³

Its uses :
⇒ Making of water vehicles - ship, submarine, etc.
⇒ To determine the if the metal is genuine. Eg: Gold used for jewellery.

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I mean for example acceleration gives the idea of rate of change of velocity.
more detail in simple words
You have asked for density not for acceleration :)
lo, sorry
DENSITY refers to the measure of mass per volume............................ Uses of density-----------> (1) Density is used in large cruise ships. These ships float on water because density is less than that of water.
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