Operating system and external memory. How?

Question

Operating Systems

Hello! Please answer the question:
What actions does the OS perform to manage external memory?

Answer 1

loading and unloading

Answer 2

OS functions for memory management in multiprogram systems are:
tracking (accounting) of free and occupied memory;
initial and dynamic allocation of memory to application processes and the operating system itself, and freeing memory when processes terminate;
setting program addresses to a specific area of ​​physical memory;
full or partial extrusion of codes and data of processes from the RAM to the disk, when the dimensions of the RAM are insufficient to accommodate all the processes, and their return to the RAM;
protecting the memory allocated to the process from possible interference by other processes;
memory defragmentation.