What is an Oracle in Blockchain?. An oracle delivers data from the outside world to smart contracts—prices, proofs, or attestations—so contracts can react to real events.
How it works
Oracles aggregate feeds, sign data, and publish it on‑chain. Contracts verify signatures and act on the fresh values.
Why it matters
Secure oracles make DeFi and many real‑world use cases possible; weak oracles create single points of failure.
Common pitfalls
- Relying on a single data source
- Ignoring update frequency and latency
- Not budgeting gas for regular updates
Quick example
A lending protocol reads a signed price feed to decide if a position is healthy or must be liquidated.
See also
- Smart Contract
- Flare (data focus)
- HBAR
TL;DR: What is an Oracle in Blockchain? defined in plain English with practical next steps.
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