Mandalorians, also known as Mando'ade, were a nomadic people group. This group consisted of several species all held together by one culture. The Mando'ade culture revolved around battle. War was the way they gained honor.
In most wars throughout history, the Mando'ade alllied themselves with the Sith. In later years, though, they became bounty hunters and mercenaries. During the time of the Rebellion, the Mando'ade Protectors sided with the Rebels and later the New Republic.
Mandalorians wore very distinctive battle armor, including helmets with T-shaped visors as to which was passed down to troopers of the Galactic Alliances. Their traditional "true Mandalorian colors" were silver and blue.