Clogged RAM memory

Good afternoon.
This is not critical if there are no problems in the system.
If the system runs out of memory, the system kernel will unload the most demanding processes.
From the point of view of you as a user, if there is a shortage of memory, this will lead to failures in the operation of services and services.
Memory usage is controlled by the system kernel. If processes need memory, they request memory from the kernel.
If the system runs out of memory, it will start using SWAP.
The active use of swap memory may indicate a lack of memory in the system.