Q. What is the difference between “Save to List” and “Request It?”

"Save to List" is used when you do not want to request an item, but want to remember it for future reference.  Adding it to your list will create an entry on a digital list with the item information. 

"Request It" will place a hold on the item that will then have the item sent to a location you prefer for check out.  Requesting an item will guarantee you will get a copy, but if there is a waiting list it may take some time to arrive.