How did corner back get its name?

The term "cornerback" derives from the player's position on the field, specifically at the "corner" of the defensive backfield. Cornerbacks primarily defend against wide receivers and are positioned on the outer edges of the formation, often near the sidelines. Their role involves covering receivers and preventing pass completions, which is a critical function in football's defensive strategy. The name reflects both their location on the field and their responsibilities in pass defense.