simple tango
A way of dancing tango characterized by its lack of fancy figures or patterns. Only the most "basic" tango steps and figures such as caminadas, ochos, molinetes, etc., are utilized. boleos, ganchos, sacadas, sentadas, and other fancy moves and acrobatics are not done. A very early term for tango de salon.
(from batango.com (http://www.batango.com/Loomis.htm))
Tango liso ( in this case liso means "simple" and not "smooth" like most foreigners translate that word) is a form of Salon style without "firuletes" embellishments of any sort.
It is the form or style most of us started dancing as it is devoid of all complications and easier to do.
You start by standing erect with some "plie" o "arrugue" (bending of the knees) with close embrace but having some "light" (separation) between the bodies, you walk in front of the lady with that embrace. ([1] (http://tango.romanvirdi.com/tango-liso.htm))