[CentOS] what would be happen if swap partition is not?

Hello, all.

 

I know the function of the swap and can make swap partion or file. 

 

But, if there is no swap partion at system, what would be happen?

that makes the system unstable or not?

 

I have one system that has no swap, but there was no problem until now.

 

 

Thanks in advance.

 

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