Contents What and Why? Simple Allocation Strategy External Fragmentation Memory Paging Demand Paging Virtual Memory Layout Stack Allocation Heap Allocation Memory Mapping What and Why? Have you ever wondered why computers need main memory (RAM) when they already have disk storage? The answer lies in access speed. While disk storage is permanent, it is much slower than main memory. RAM sacrifices volatility for speed—data is lost when the power is off, but access times are much faster. As a resul...