What are the key ideas of augur?

Could you please elaborate on the key ideas behind Augur? As a decentralized prediction market platform, how does it aim to revolutionize the way we make predictions and what are its main features? I'm particularly interested in understanding its smart contract system, reputation-based oracle system, and the incentives it offers to participants. Additionally, how does Augur aim to ensure transparency and accuracy in its predictions, and what sets it apart from other prediction platforms?