Argentine tango dancing consists of a variety of styles that developed in different regions and eras, and in response to the crowding of the venue and even the fashions in clothing. Even though the present forms developed in Argentina and Uruguay, they were also exposed to influences re-imported from Europe and North America. There are records of 18th and early 19th century tango styles in Cuba and Spain, while there is a flamenco tangos dance that may share a common ancestor in a minuet-style European dance. Consequently there is a good deal of confusion and overlap between the styles as they are now danced - and fusions continue to evolve.
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. 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 her weight on both feet at the same time.
Argentine tango is danced counterclockwise around the outside of the dance floor (the "line of dance") and dance "traffic" often segregates into a number of "lanes"; cutting across the middle of the floor is frowned upon. In general, the middle of the floor is where one finds either beginners who lack floor navigation skills or people who are performing "showy" figures or patterns that take up more dance floor space. It is acceptable to stop briefly in the line of dance to perform stationary figures, as long as the other dancers are not unduly impeded. The school of thought about this is, if there is open space in front, there are likely people waiting behind. Dancers are expected to respect the other couples on the floor; colliding or even crowding another couple, or stepping on others' feet is to be avoided strenuously. It is considered rude; in addition to possible physical harm rendered, it can be disruptive to a couple's musicality.