Postal voting in the United States
Postal voting in the United States, also referred to as mail-in voting or vote by mail, is a form of absentee ballot in the United States. A ballot is mailed to the home of a registered voter, who fills it out and returns it by postal mail or drops it off in-person at a secure drop box or voting center.
Source: Wikipedia — Postal voting in the United States (CC BY-SA 4.0)