Argentine tango is a partnered social dance, in which the couple embraces to dance. It is different from ballroom dancing (including ballroom tango) in its posture, movement and intent. Unlike ballroom dances, which tend to be more structured, social tango is improvised, with every step being a spontaneous discovery in the moment, as the partners focus on their connections to each other and to the music.
Although Argentine tango is generally confined to "regular" rhythms, it has an infinite variety of step patterns. Nonetheless, what makes tango isn't the steps but the manner in which the steps are danced. The connection between partners is not so much a result of anything in the dance as it is a requirement to dance successfully. In order to dance with every step spontaneously improvised, both partners must be paying full attention to each other.