The Katana is a Samurai blade. Their were other blades used by Samurai before the Katana gained popularity but for all modern purposes they are one and the same.
from the hub 'Buy Samurai Swords - Ninja Swords - Japanese Katana'
As legend has it, around 700 CE master sword smith Amakuni created the first nihonoto (Japanese sword). He is believed to have forged the very spirit of the warrior into the folds of this deadly single edged weapon. The katana, or samurai sword as it is commonly referred to, is the most famous of the Japanese swords. It was the chosen weapon of the samurai in feudal Japan. The deadly assassins known as the ninja is also believed to have used the katana as their weapon of choice despite popular belief in the ninjato popularized by classic cinema.