Free key word Function

hi experts,
i am confusing with free key word usage.
right now i have not used FREE in my abap programs.
i read documentation it is saying
FREE:-Releases the memory space needed to process the internal table itab.
My doubt is why i need to Release the internal table memory. if i am not using what is the problem.
Please help me

When you execute a program it occupies certain memory space on apllication server . If your internal tables are huge ( large no of rows ) and you do not need them further in your program it is good to use Free itab so that memory is released and can be used by other programs ( this will increase the performance of your application server ). Otherwise this memory is only freed up when your program ends. If your internal table is expected to have not many rows then free itab does not have much significance.
Cheers.

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