Yoda was one of the most renowned and powerful Jedi Masters in galactic history. He was known for his legendary wisdom, mastery of the Force and skills in lightsaber combat. Yoda served as a member of the Jedi High Council in the last centuries of the Galactic Republic and reigned as Grand Master of the Jedi Order before, during and after the devastating Clone Wars. Following the Battle of Geonosis, Yoda held the title of Master of the Order in addition to that of Grand Master. In his centuries of service to the galaxy and the Force, Grand Master Yoda had a hand in the training of nearly all the Jedi in the Order, including such luminaries as Obi-Wan Kenobi, Ki-Adi-Mundi and Oppo Rancisis; all of which would come to serve on the Jedi Council along with him.
Standing at about 66 cm tall, Yoda was a male member of a mysterious species, details of which he did not reveal. Yoda served as a member of the Jedi Order for centuries, eventually gaining a seat on the Jedi High Council, before reigning as the Grand Master of the Jedi. He had exceptional skills in lightsaber combat, most commonly employing whirling and acrobatic Form IV techniques. Yoda was a master of all but the Vaapad subset of Form VII (he had mastered the original Form VII variant known as Juyo) of lightsaber combat, and was considered by many as a Swordmaster.
Though arguably the Order's greatest master of the Force and most skilled warrior, Yoda believed most firmly in the importance of instructing younger generations and never missed an opportunity to ensure his students learn from their experiences. At heart, the diminutive Jedi Master was a teacher; indeed, he instructed nearly all the Jedi in the order, to some extent, during his reign as Grand Master.
Though Yoda was, arguably, the most highly Force-attuned member of the Order, he was not flawless. It was partially due to his failure to recognize that Supreme Chancellor Palpatine was actually responsible for the outbreak of the Clone Wars, and was in fact the Sith Lord Darth Sidious, which led to the Republic being overthrown and the Jedi Order being decimated. The Grand Master was among the few Jedi to survive Emperor Palpatine's Great Jedi Purge, after the beginning of which, he went into exile on the swamp planet of Dagobah.
Later, before dying and becoming one with the Force in 4 ABY, the exiled Jedi Master was responsible for the instruction of Luke Skywalker who would use Yoda's training as a basis for the creation of a New Jedi Order, after defeating the Sith. Following his death, Master Yoda retained his identity within the Force and was revered as among the most legendary Jedi Masters of all time by Skywalker's reconstituted Order.