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free pointer in C is a basically a function that's take pointer variable as a arguments and deallocate the memory of pointer.
Syntax: free(pointer_variable);
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A free pointer in C is a pointer that has been deallocated using the free() function. The free() function releases the memory space pointed to by a pointer that was previously allocated using malloc(), calloc(), or realloc().
After calling free(), the pointer still points to the same location, but the memory is marked as free and can be overwritten by other allocations2. Therefore, it is a good practice to set the pointer to NULL after freeing it, to avoid using a dangling pointer.
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A free pointer refers to a pointer that has been deallocated using the free() function. This means the memory the pointer originally pointed to is now available for other uses. We avoid using a free pointer because attempting to access the deallocated memory leads to undefined behavior, often causing program crashes. To prevent errors, it's best practice to set a free pointer to NULL immediately after calling free().