We have several threads going on at the moment with arguments about the applicability of various martial arts to self-defense. Some of the disagreement seems to boil down to different ideas about what self-defense means in the first place. I thought I'd toss out some of my own definitions to clarify at least my own statements in those threads and possibly those of some others.
Fighting - covers any situation where two or more people are trying to violently defeat each other. This can occur in a sportive or a street context. The combatants may be armed or unarmed. They may be operating under different sets of rules (even in a non-sportive context). Just a few examples of a fight might be: a MMA bout between two pro fighters, three cops subduing a resisting suspect, a pair of drunks squaring up outside a bar over some verbal offense. Many, many more situations are possible. These different contexts significantly affect what tactics, principles, and techniques are most effective in winning the fight. Nevertheless, there is significant overlap in what works as well.
Not all violent situations are fights. A canny asocial predator will attempt to use surprise, intimidation, or overwhelming force to ensure that there is no fight - that all the violence is directed towards his victim with no resistance.
Most fights are not self-defense, but some are. (None of the examples I listed above would qualify.)
Self-defense - covers the necessary actions and skills to get home at the end of the day unharmed by violence, without any unscheduled stops along the way at the hospital or prison. Some of the relevant factors here include lifestyle, awareness, attitude, de-escalation skills, evasion skills, and understanding of how different types of violence begin.
Most of self-defense does not involve fighting. Sometimes it does, but usually that is an indication that you have either screwed up the other important aspects of self-defense or else gotten really unlucky. If you get into fights on any sort of regular basis and it's not part of your job, you should strongly consider the possibility that you are not just unlucky.
Based on these definitions, fighting and self-defense can be seen as separate circles in a Venn diagram with about 5% of overlap.
Martial arts: For some reason many people like to bring up the derivation of "martial" as evidence that martial arts have something to do with the arts of war. Regardless of the etymology, the overwhelming majority of martial arts have nothing at all to do with war-fighting.
Given the diversity of the martial arts, the best definition I can muster is "a formalized system in a certain historical context for training certain skills, attributes, or techniques in some way related to or derived from methods of violence." This can cover a lot of ground, for example:
- an acrobatic performance art with stylized movements derived from old fighting techniques
- an historical recreation of medieval swordfighting methods
- a system for cultivating certain spiritual or mental attributes through the practice of physical techniques
- a system for unarmed fighting in a civilian context
- and many, many more.
Chris would probably insist that a martial art has a unifying set of principles that tie together its various techniques and training methods. I think it might be overstating the case to say that this is always true. I've seen plenty of martial arts where the principles don't really seem that unified.
Once you understand the nature of fighting, of self-defense, and of a given martial art, then you are in a better place to evaluate how your martial arts training may affect your ability to defend yourself or to win a fight in a given context. Bear in mind that defending yourself and winning a fight are not the same thing. For example, if your training encourages your aggressive nature, then it may help you win a fight. If your training helps you stay calm, it may help you walk away from a fight, which is a much higher form of self-defense.