Difference between tail->next != NULL and tail != NULL

#1

In the code https://ide.codingblocks.com/s/8634 in insertAtTail function why can’t we write tail != NULL instead of tail->next != NULL , basically what is the difference in tail->next != NULL and tail != NULL

#2

@princeguptaa
a) in tail !=NULL we are checking whether tail pointer is NULL or not
b) tail->next!=NULL here we are checking whether the pointer that is in next of tail pointer is null of not
clearly both are different things.

#3

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