Oracles aren’t just links between blockchains, the external world, and other entities. They are an infrastructural layer that improves the efficiency of the core network. Oracles verify, authenticate and query external data resources before wiring them back to the requesters. They can move data in many forms, including price data, information about successful trade executions, and temperature data from sensors. Some oracle solutions are capable of transferring data to smart contracts and reverting it back to external sources. Read more..
Blockchain Oracle and its workability
