Argentine and Ballroom Tango use very different techniques and vocabularies, to the point where some consider them related in name only. In Argentine tango, the body's center moves first, then the feet reach to support it. In ballroom tango the feet move and the whole body weight follows.
Ballroom tango steps are staccato, and generally follow a specific "slow, slow, quick, quick, slow" rhythm. The "slow" steps are best described as 'quick, hold', as the dancer rushes to step and then holds before rushing to the next step. This matches the staccato accents that appear in ballroom tango music.
In Argentine tango, the steps are typically more gliding, but can vary widely in timing, speed, and character, and follow no single specific rhythm. Because the dance is led and followed at the level of individual steps, these variations can occur from one step to the next. This allows the dancers to vary the dance from moment to moment to match the music (which often has both legato and/or staccato elements) and their mood.
The Argentine Tango's frame, called an abrazo or "embrace," is not rigid, but flexibly adjusts to different steps, and may vary from being quite close, to offset in a "V" frame, to open. The Ballroom Tango's frame is more rigid, with the arms tenser and held higher.
There is a closed position as in other types of ballroom dance, but it differs significantly between types of tango. In Argentine Tango, the "close embrace" involves continuous contact at the full upper body, but not the legs. In Ballroom tango, the "close embrace" involves close contact only at the hips and upper thighs, and not the upper torso.
In Argentine Tango, the ball or toe of the foot may be placed first. Alternately, the dancer may take the floor with the entire foot in a cat-like manner. In the International style of Tango, "heel leads" (stepping first onto the heel, then the whole foot) are used for forward steps.
Ballroom tango steps stay close to the floor, while the Argentine Tango includes moves such as the boleo (allowing momentum to carry one's leg into the air) and gancho (hooking one's leg around one's partner's leg or body) in which the feet travel off the ground. Argentine Tango features other vocabulary foreign to ballroom, such as the parada (in which the leader puts his foot against the follower's foot), the arrastre (in which the leader appears to drag or be dragged by the follower's foot), and several kinds of sacada (in which the leader displaces the follower's leg by stepping into her space).
Most other types of tango, such as Finnish and Chinese, are close to the Argentine in their technique and vocabulary.