A
cornerback (
CB) (also referred to as a
corner) is a member of the
defensive backfield or secondary in
American and
Canadian football. Cornerbacks cover
receivers, to defend against pass offenses and make tackles. Other members of the defensive backfield include the
safeties and occasionally
linebackers. The cornerback position requires speed and agility. A cornerback's skillset typically requires proficiency in anticipating the
quarterback, back-pedalling, executing single and zone coverage, disrupting pass routes, block shedding, and tackling. Cornerbacks are among the fastest players on the field.