grooves are fighting styles and special bars that are used in capcom vs snk 1 and 2.
In CvS 1, there are only two kinds of grooves: Capcom and SNK
In CvS 2, however, there are 6 kinds of grooves: C. A. P. for capcom and S. N. K. for SNK groups
C grooves: Street fighter alpha's A-ism A grooves: mix of SFA's V-ism and SF Ex2 plus's Excel P grooves: Street Fighter 3 S grooves: KOF 95 N grooves: KOf 98 (i think ??) K grooves: Samurai Shodown