I took this from some website:
Argentine Tango is a social dance (i.e. lead and followed, not choreographed). Argentine Tango has very few of the lunges and dips, nor do partners stride across the room with arms out and a rose between the lips. Instead, partners are almost completely in a close, closed posion, very inward in attitude, trading footsteps and decorations.
The Argentine basic steps are built out of grapevines, figure eights, turns, and walking, to which are added dramatic pauses, quick steps, syncopations, foot decorations and leg hooks, to mention a few. One wierd and wonderful thing is that the dancers may walk in crossed feet (left with left) rather than the mirror we are used to. While the leader “walks” the follower around, the leader’s feet may pause, switch to crossed feet, step into the stride of the follower, or appear to displace the followers footsteps.
