memory usage

what does this mean? memory usage from WHM, I'm not sure I'm getting all my allocated memory from my VPS...

Current Memory Usage
total used free shared buffers cached
Mem: 4005812 3539208 466604 0 153856 1670928
-/+ buffers/cache: 1714424 2291388
Swap: 4194272 3798300 395972
Total: 8200084 7337508 862576

 

 

 

 

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