What happens if the RAM and swap file are full?

Question

Operating Systems

What will happen to the computer? Lag or programs will fly out?

Answer 1

There will be memory allocation errors.
Many programs rely on the fact that the memory is conditionally infinite. So yes, they will crash.

Answer 2

Yes. a northern animal will come running to the system.
there are subsystems that shoot heavy applications when the memory is full, Out-Of-Memory Killer