An oracle is a bridge between the blockchain and the real world. They act as on-chain APIs you can query to get information into your smart contracts. This could be anything from price information to weather reports. Oracles can also be bi-directional, used to “send” data out to the real world. Oracles provide external data to smart contracts that operate on blockchain technology. They are essentially a form of communication between the outside world and the world of blockchain. Because blockchains and smart contracts are closed systems — where there are rigid processes for connecting...