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.