Virtual memory gives each process a private set of addresses that the OS maps to real physical RAM. Your program sees a clean, continuous range starting near zero, even though physical memory is shared and scattered.
The hardware and OS translate every virtual address to a physical one during access. A process can only reach memory it owns, because its map simply has no entry for anyone else's pages.
That isolation is the main payoff. One process cannot read or corrupt another's data through a stray pointer. It also simplifies your code, since every program can assume the same familiar layout. And it lets the machine run programs whose combined footprint exceeds the RAM actually installed.
Rewriting in plainer words…
This answer doesn't lend itself to a diagram - it reads best . No credits were charged.
