dynamic memory allocation is the allocation of memory

storage for use in a computer program during the runtime of

that program. It can be seen also as a way of distributing

ownership of limited memory resources among many pieces of

data and code.

Dynamically allocated memory exists until it is released

either explicitly by the programmer or by the garbage

collector. This is in contrast to automatic and static

memory allocation, which have a fixed duration. It is said

that an object so allocated has a dynamic lifetime.