the series takes place two and a half years after the previous volume. While simply referred to as Part II in the manga, the anime gave this part of the series the name Naruto: Shippūden (ナルト 疾風伝, Naruto: Shippūden? lit. Naruto: Hurricane Chronicles). To increase the gap between the manga and anime, so as to not allow the anime to catch up to the manga too quickly, the anime adds several filler arcs.
Naruto: Shippūden tells the story of a matured and older cast from the original series. After training for 2½ years with Jiraiya, Naruto returns to Konohagakure, reunites with the friends he left behind, and reforms Team 7 (renamed Team Kakashi), with Sai replacing Sasuke.
Unlike the original series, the organization of Akatsuki, which played a minor role earlier, takes on the main antagonist role in their attempts of world domination. All of Naruto's classmates have matured and improved in the ranks, some more than others.
It's a good idea to watch Naruto first 
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