A ballot is a system used to cast votes in an election and may be found as a piece of paper or a small ball used in secret voting. It was invented in Italy around the 16th century.
Each voter uses one ballot, and ballots are not shared. In the simplest elections, a ballot might be a scrap of paper. The voter casts their ballot in a box at a polling station.
In British English, this is usually called a "ballot paper".