When it's properly used, it's almost invincible

See, I have this thing where I'm really curious about random things & get excited when I learn new stuff...
it tends to be boy stuff because I like boy stuff. But 'member, it's like I always say: tomboyish tendencies in a girly package, ya dig. Upon further review, this one's not all that random since I was drenched in Wu from the time I was like 15.

SAMURAI VS. NINJA!

The Quick Trick: Samurai wore elaborate armor and never stabbed anybody in the back; ninjas wore no armor and loved stabbing people in the back.

The Explanation:
The word samurai is somewhat analogous to European knight: They were considered nobility, worked for noble higher-ups, and were renowned for their great bravery and code of honor. So much so that all the little kids wanted to grow up to be samurai! (Or so we imagine.) Ninja, on the other hand, were well-disguised mercenary assassins governed by no code save secrecy.

The samurai arose in the 10th century, working as a kind of police force for the Japanese city of Kyoto. By the 12th century, the samurai life as we know it today was established; samurai were well-educated men who could read, write, and kill thanks to their extensive martial arts training. They also adhered to the Bushido, an orally transmitted ethical code that forbade samurai from striking enemies from behind or pillaging unnecessarily. It also required them to commit ritual suicide, known as Seppuku, if they dishonored themselves or the samurai tradition.

At the peak of the tradition, between 7 and 10 percent of the Japanese population—most of Japan’s army—were considered samurai. And although samurai are usually depicted with swords, they did adapt to modern warfare with firearms in the late 16th century. In fact, samurai helped Japan to win wars against Korea, China, and even Spain, staying on the scene until the end of the 19th century.

If the samurai relied upon a code of honor, the ninja relied upon their stealth and ferocity. Technically, a ninja is anyone who practices the Japanese martial art ninjutsu (meaning that you, too, can become a ninja just by visiting your local neighborhood dojo!). Because ninjutsu teaches everything from stick fighting and knife throwing to disguising yourself and predicting the weather, figures like the 16th-century Shogun Tokugawa Ieyasu have employed ninja tactics to escape enemies early in their political careers. But almost from the beginning, the myth of the ninja proved even more compelling than the reality of them. Long before their portrayal in movies, ninjas were romanticized by everyday Japanese citizens, who shared stories of the ninjas flying, or making themselves invisible. The real ninjas, meanwhile, were mostly schlepping about, spying and assassinating, just trying to pay the bills.

- Link