In the Star Wars film, Yoda is a Jedi master and has been involved in the training of countless Jedi. Yoda trained Count Dooku as well, who eventually turned to the dark side. Yoda also trained Luke Skywalker in his later training stages.
Yoda dies in the Return of the Jedi after spending time furthering Luke Skywalker's training as a Jedi. In his final moments he confirms to Luke that his father is ineed Darth Vader and that he has a sibling. He then dies at the age 900 and his body dissapears, becoming one with the force.
In the prequel films released many years after the original movies, Yoda is shown looking much younger and is even involved in an awesome fight scene that many Star Wars fans had been waiting to see for years. Yoda is depicted as being extremely fast and able to more than hold his own against a very good opponent, much to the delight of Star Wars fans everywhere.
Below are a few of the different LEGO Star Wars sets that include a LEGO Yoda mini figure:
X-wing Fighter 4502
Jedi Duel 7103
Wookiee Catamaran 7260
Separatist AAT 8018