It may be useful to think in terms of data memory in C and C++ as being divided into three separate spaces: Static memory. This is where variables, which are defined outside of functions ... to ...

Reserving memory for specific purposes. At startup, operating systems and applications reserve fixed amounts of memory (RAM) and may allocate more as needed. Although a virtual memory function ...

Modern operating systems perform dynamic memory allocation for their own use. They may also perform the same operation for their applications, or they may include programming interface functions ...