Counter Attacks (カウンター, Kauntaa), otherwise known as Reversals in some circles to help distinguish more from the traditional counter hit, are moves that are activated once the user has been hit by a certain attack. Counter Attacks are either regular special attacks or Super Moves, the latter of which are somewhat rare due to the usually offensive nature of Super Combos and the like. Counters generally have a weakness to projectiles and, in Street Fighter IV, moves that can break Super Armor.
Special CountersEditDudley's Cross Counter, shown at right (offensive), and Juri's Kasatushi (defensive).
Special Counters can generally be used to counter most attacks, though they have somewhat less versatility (e.g. Dudley's Cross-Counter not being able to counter low attacks); among the exceptions are Shin Akuma's Tenma Shurettou, which counters high and low attacks based on the input, and Gouken's Kongoshin, which counters high, middle or low attacks based on the input.
Some Super Combos and other similar moves act as counters. An example of such a move is Remy's third Super Art, Blue Nocturne; the counter triggers upon Remy being struck with his knee up after activation.
In Super Street Fighter IV, Fei Long's Gekirinken and Cammy's CQC (Cammy's Quick Combination) are the only two Ultra Combos that act as counters. Both share the Street Fighter IV counter's common weakness to Armor Breaking moves, and an overall weakness to projectiles.