"building" the structure for the problem below...

"Create a structure that has one variable called value and one pointer to the list (making it a linked list). Prompt for 5 values from the keyboard as input and store them in the linked list. Print out the current contents of the list. Allow the user to add one more value to the linked list, and print the contents of the list again."I've seen the following in other Chegg answers but I don't understand where they get "head", "temp" "myiterator." This is not something I have seen in my book, so can I "build" the structure another way?

struct ListNode *head=NULL;

struct ListNode *temp,*last;

struct ListNode *myIterator;