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When Dynamically allocated memory is not freed after its use, it leads to memory leak.
It is a very sensitive issue in embedded programming

when dynamic allocated memory is not freed after its use. This result in the memory leak.

A memory leak refers to the memory which cannot be accessed. More simply, The pointer which was pointing to the memory has been destroyed.

I think this question can be extended into how to avoid memory leak

Char *ptr1= malloc(sizeof(5));

Char *ptr2= malloc(sizeof(6));

ptr1=ptr2;
free (ptr1); /* now it frees the ptr2 allocation */
here the 5 allocated is memory leak which can be freed as we dont have the pointer of that memory location.

When dynamically allocated memory is not freed and the pointer which was pointing to that memory space goes out of the program scope or is re pointed to null than that chunk of memory is said to be leaked