Different states use different voting machines, some states have several kinds.
Some will provide a ballot to mark by hand which will then be scanned by a machine. Others will use a computer screen – known as a direct recording electronic (DRE) machine – to cast a ballot.
Many state and local election officials have information on voting machines on their websites and some conduct in-person demonstrations in advance of the election. You can get your state website on the Election Official Directory. Choose your state and region to find the link to your Local Elections Website and will also find the contact and address of your local election official.