What is the Oracle's Problem? Best Blockchain Oracles Projects

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To the ancient Greeks, an oracle was a person who imparted knowledge from another world. In blockchains, oracles help blockchains gain external data. While blockchain oracles may not be prophetic, blockchains and smart-contracts (the code that automates blockchain transactions) cannot access external data on their own, they need an oracle to do it. Blockchain data is deterministic, meaning it has a sequence. Normal data is non-deterministic, meaning there’s no mechanism that proves the order by which the data was created. The problem is that oracles can ruin the decentralized data of blockchains. How?