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free -h total used free shared buff/cache available Mem: 7.7G 2.1G 622M 362M 5.0G 4.9G Swap: 7.5G 984M 6.5G

here free memory is shown as 622M and available memeory is 4.9G.

marked as duplicate by vidarlo, Florian Diesch, DK Bose, karel, Eric Carvalho Jun 3 '18 at 11:59

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Free memory is memory that is currently unused. Available memory is memory that the system is using for caches, but the data that it holds can be discarded easily (so without swapping to disk) and used for other purposes. Modern systems try to keep free memory relatively small because free/unused memory is just wasted.

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