Argentine tango is danced in an embrace that can vary from very open, in which leader and follower connect at arms length, to very closed, in which the connection is chest-to-chest, or anywhere in between.
Tango dance is essentially walking with a partner and the music. Dancing appropriately to the emotion and speed of a tango is extremely important to dancing tango. A good dancer is one who transmits a feeling of the music to the partner, leading them effectively throughout the dance. Also, dancers generally keep their feet close to the floor as they walk, the ankles and knees brushing as one leg passes the other.
Argentine tango dancing relies heavily on improvisation although certain patterns of movement have been codified by instructors over the years as a device to instruct dancers, there is no "basic step." One of the few constants across all Argentine tango dance styles is that the follower will usually be led to alternate feet. Another is that the follower rarely has his or her weight on both feet at the same time. In many modern variations of Argentine Tango, particularly in Europe, teachers of Tango may establish a "basic step" in order to help students to learn and pick up the "feel" of the dance.