Answer / mohd sohail

Sawp means treating some hard disk memory as ram

Answer / farooq

Both Answer No.1 and No.2 above are correct answers in combine.
if you look at it individually short answer No.1 is to the point.

my answer:-
Swap is Commonly known as virtual memory.
Swap is a Hard drive space an operating system reserves to use it as RAM (Random Access Memory), the amount of space used can be adjusted(increased or decreased). It is as good as RAM, not a permanent memory. very slow comparing to actual RAM, it also effects the system performance,
Farooq Mohiuddin

Answer / purushotham

SWAP over writes the buffer content.

Buffer is a temporary memory area and it contain frequently accessed and rarely changed objects.

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