Difference between memory allocation and paging in modern operating systems -

I have recently been researching the operating system, especially in relation to memory management, though, I'm not sure that the memory What is the difference between pool or body systems, and virtual memory components such as paging, memory management plans. Do they both meet the same thing or different things? How do they generally apply to the modern operating system?

These are supplemental memory management usually indicates that in order to capture an object in a program virtual How the address space is allocated. The goal is to reduce the fragmentation.

Virtual memory is a system that allows processes to understand that they keep more memory, actually exist, sharing the parts of their memory without worrying about the rest of the processes Allows. The task of the OS is to decide which page should be supported from physical memory, and how to swap people not in use.