Dynamic Memory Allocation

Memory for your program will be allocated at the time of the execution of the program. 

Memory allocation determined at the time of the compiling is called as Static Memory Allocation

Memory allocation determined at the time of the execution of the program is called as Dynamic Memory Allocation

Static memory allocation is done inside Stack Memory

Dynamic memory allocation is done inside Heap

Dynamic Memory Allocation in C Language can be done using four predefined functions defined in stdlib.h

malloc()

calloc()

realloc()

free()