Voting machine terms defined
There are many types of devices that can be described as voting machines, here are some common terms and jargon used in the field.
DRE: Direct Recording Electronic. A device that gathers votes through a user interface, stores them internally, and then produces a tabulation of the votes at the end of the voting period.
OpScan: Optical Scanner. This device tabulates the vote result by scanning paper ballots that might be bubble sheets filled in by the voters, or might be produced from a ballot printer.
VVPAT: Voter verified paper audit trail. This is the capability for a voting machine to produce a lasting paper record which is reviewed by the voter prior to casting the final vote.