Rook sacrifices on c3 (xN) in the Sicilian Dragon
White's idea is RxNh5. Black's idea in the Sicilian Dragon is to bust up the white queenside with Rxc3
Black hopes to induce bxc3, when Black gains access to squares like a3 and c4 for operations. Combine that with an active Bg7 bishop and Black can achieve mate or material gain. Here are many hundreds of high-quality master games to persuse and study.