memory lead

what is mean by memory leak in c programming ?? can anyone explain with an example??plz.

 

If you allocate memory dynamically from the heap, then don't return it before the program exits, it's no longer available for other programs.

 

Here is the example

Code:

int main()
{
char *buffer1;
char *buffer2;
buffer1 = (char *)malloc(5*sizeof(char));
buffer2 = (char *)malloc(5*sizeof(char));
buffer1 = buffer2; // This will lead Memory leak
.
.
.
.
}