What's the difference between cigarette and cigar?

A cigarette is a small cylinder of finely cut tobacco leaves rolled in thin paper for smoking. The cigarette is ignited at one end causing the cigarette to smoulder and allowing smoke to be inhaled from the other end, which is held in or to the mouth. Most modern manufactured cigarettes are filtered, and also include reconstituted tobacco and other additives.

A cigar is a tightly-rolled bundle of dried and fermented tobacco leaf, rolled in a series of types and sizes, that is ignited so that its smoke may be drawn into the mouth.