Canvassing is the systematic initiation of direct contact with individuals commonly used during political campaigns. Campaigners will knock on doors or make telephone calls (also known as phonebanking) to engage in a personalized contact with an individual. It is used by political parties and issue groups to identify supporters, persuade the undecided, add voters to the voters list through voter registration, and it is central to get out the vote operations. It is the core element of what political campaigns call the ground game or field.