Concept of free –m command in Linux

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http://www.unix.com – I wanted to know the concept of free –m command as there are different rows of Mem, -/+ buffers/cache & Swap in the output. As an example, it is showing 195 as free Mem in my server but 13850 in the free section of the -/+ buffers/cache row. The output needs in depth knowledge of the different parameters of the command. I hope, my question is clear. Please revert with the reply to my query. Regards (HowTos)