K too though.

Learn how to use d.MP, a four frame startup attack, for free combos in Capcom vs. SNK 2 by canceling into beatdown punches or launching kicks.

d.MP is a four frame startup attack that can perfectly cancel into the beatdown punches or launching kicks. You can often get a free combo when you JD (Jump Dash) certain laggy attacks your opponent throws out, such as a Blanka d.HP. A fast attack like d.MP is the ideal move to exploit that window for a free combo.