Also, as a member of the Uchiha clan, he inherits the Kekkei Genkai (or bloodline trait) of the clan: the Sharingan. He begins to unlock it in the fight with Haku (who himself was using a Kekkei Genkai) and gradually gains strength as he learns to use it to track movements and observe ninjitsu techniques. It helps to have an airhead like Naruto as a teammate. She doesn't like Naruto at first, but as they and Sakura learn to work as a team, she shows a surprising willingness to protect Naruto. It is the beginning of a quite complex partner/rival relationship, since each one looks out for the other but at the same time wants to be better than the other. When Sasuke fought Naruto, they each used a powerful jutsu. Naruto uses Rasengen and Sasuke uses Chidori. Chidori, also known as Raikiri (lightning blade), is a jutsu taught to him by Kakashi.
*That sword is the one Sasuke carries after leaving the Leaf Village to train with Orochimaru, one of the main anatganists in the series. Sasuke seeks to kill his older brother to get revenge when Itachi (Sasuke's brother) went berserk and murdered the entire Uchiha clan except him and Sasuke. After two years with Orochimaru, Sasuke killed him when he realized that he had surpassed his master and no longer needed him. After that, we see him charging, but rarely using the sword. Though this is probably due to the fact that we've only seen a little of what happened to Sasuke after he put together a team to help him track down his brother.