what is lost heap dynamic? and how it is created. explain indetail

I had this question after viewing Find dangling pointer or lost heap-dynamic  variables..
priscilla ammisettiAsked:
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phoffricConnect With a Mentor Commented:
• Lost heap-dynamic variable (garbage)
– An allocated heap-dynamic variable that is no longer accessible to the user program
• Pointer p1 is set to point to a newly created heap-dynamic variable
• Pointer p1 is later set to point to another newly created heap dynamic variable
• We now have a memory leak

If you say Type *ptr = new Type; and then say ptr = NULL;
then the allocation of the Type object is not longer available. The memory is still allocated on the heap, but the program has lost permanent access to it. It is just taking up memory and will not be released until the program ends.

In the above scenario, if you are in a loop doing the new and the ptr = NULL; then the program's memory usage keeps increasing as more Type objects are thrown away on the heap. You have to delete the Type object before setting ptr to NULL.
priscilla ammisettiAuthor Commented:
tel me very fast pls
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