Tailwheel (conventional) landing gear is an aircraft undercarriage consisting of two main wheels forward of the centre of gravity and a small wheel or skid to support the tail.
The term taildragger is aviation jargon for an aircraft with a conventional undercarriage, although some writers have argued that the term should only refer to an aircraft with a tail skid and not a tail wheel.
Taildraggers are considered harder to land and take off.