Dominion Voting Systems Corporation is a North American company that produces and sells electronic voting hardware and software, including voting machines and tabulators, in Canada and the United States. The company's headquarters are in Toronto, Ontario, where it was founded, and Denver, Colorado. It develops software in offices in the United States, Canada, and Serbia. Dominion produces electronic voting machines, which allow voters to cast their votes electronically, and optical scanning devices used to tabulate paper ballots. Dominion voting machines have been used in countries around the world, primarily in Canada and the United States. Dominion systems are employed in Canada's major party leadership elections, and across the nation in local and municipal elections.