Postal voting refers to the method of distributing ballot papers to the electors through post. Such voting benefits people who may not be able to attend a polling station in person, either through a physical disability or absence from the locality.
In United states a variant of postal voting known as Vote-by-mail is used where the ballot is mailed to the home of the registered voter. The voter fills it and returns it through postal mail. The first state in United States to do this was the state of Oregon.