Advance parole and stamp
When someone comes back through advance parole, they are paroled into the U.S for a year. Just like visa holders are stamped, it means on your I-94 that you are authorized to stay legally in the U.S until that date. However, we have DACA so the date is irrelevant, once your I-94 "expires" it doesn't mean you're illegally here. You're legal as long as your DACA is valid.
Some people who came here in the U.S without inspection use that I-94 to prove that they entered the U.S legally and if they are married they can get a green card