This is not a good answer. And, I am going to explain why in my reply for
@UpSideDownGRUNT
KOF is a face paced 2D fighting game. In KOF94 and 95, there were several unique mechanics introduced such as the 3 on 3 systems, the use of hops, a charging mechanic for Desperation Moves (Supers) like in AOF, and a dodge mechanic.
It did not start to proper refine and identy itself until KOF96, however. That was the point where we got the roll system was well. KOF97 then chaged hpw the meter system works and it would be refined even more so inKOF98, which is essentially the gold standard of KOF to this very day. Based on the standards of KOF98 (along with KOF02/02UM), KOF is generally regarded as a face paced fighting game. Footsies is heavily encouraged in 98 because of its quickness and how good a lot of the normals were. Having a projectile and a command grab was also generally ideal. EVERY character in KOF is capable of some form of rush down. As for the combo system? This is not as combo centric as
@Argentus wants to believe. The combo systems makes use of chains from light normals into each other. Most characters could also chains lights into their command moves though they may not combo. It is also possible to chains CLOSE heavy normals into command moves. Most of the said command moves will end up canceling into special moves. Again, KOF is a game that advocates good mobility, a well-structured rush down game, moderate use of short-term ground game for starting an offense or defending yourself and a relatively easy to understand combo system.
EDIT:
Found some links. So instead of listening to uneducated opinions from non-KOF players, a good place to start would be in the following links below.
http://dreamcancel.com/how-to-play/
Here are some FAQS I set up a long while ago in relation to XIII, most of which can apply to XIV.
http://dreamcancel.com/wiki/index.php?title=The_King_of_Fighters_XIII_FAQS
Last but not least... SRK. Shout outs t good ol' Laban!
http://wiki.shoryuken.com/The_King_of_Fighters_'98:_The_Slugfest