A recumbent trike is a three wheel cycle with a wide seat that has a back support and is positioned so that the rider’s legs are extended horizontally forward to the pedals and the body is reclined.  Recumbent trikes come in two of different forms.  Delta trikes have one wheel in the front and two wheels in the back and tadpole style have two wheels out in front and a single wheel in the back.  I ride a tadpole trike on my world tour. 

Recumbent trikes can come in pedal powered and electric, and have a huge amount of accessories you can choose from to customize and personalize.  Base models typically have 20 inch wheels in the front and rear, with alternate forms with 26 inch or equivalent on the rear and sometimes even all three wheels at 26 inch.

A trike is like a comfortable lawn chair on wheels.  You never have a sore butt, back, neck or shoulders, and without that pain you can focus your attention on your surroundings and interacting with the world instead.  Another plus lies with the fact that many people rarely, if ever, see a trike in their life.  This encourages engagement with the locals.  People that might never talk to a person riding an upright bike find the trike irresistible.  For a social person like myself, its a perfect scenario.