Evangelion Unit-02 is the third evangelion ever made. It was the first production model. It was built for combat. Eva Unit-02 was assembled and tested in Germany and manufactured and designed in Japan. The first evangelion to fight underwater and piloted by two pilots at the same time, it is a very good evangelion. The first one made for actuall combat, like Asuka said, it is the first "real" evangelion. In End of Evangelion, Eva Unit-02 was brutally and savagely eaten by the Mass Production Model Evangelions. A very dramatic and cruel fate for such a good Evangelion.
Eva Unit-02 has lived through many harsh battles, and yet, has been repaired several times. Some battles that Eva Unit-02 failed at was the battle with Eva Unit-03/Bardiel, and the battle with the 14th Angel, Zeruel. Eva Unit-02 however is not that good at hand to hand combat, although it was created and built for it. It does however get the job done.