In short, a cigar is a rolled bundle of dried and fermented tobacco leaves. They have a 20+ blend mix of several tobacco's.
Most desired leaf colour for wrappers: Light, Sumatra. All varies by type of tobacco, size of cigars and filtered cigars or cigarillos. Havana cigars are two to four filler leaves, which are rolled into a tube and then enveloped by the binder leaves. Then the wrapper finish the cigar. There is so much more to write about it, but there is information about this item to find if you really want to know more.