# What's the difference between Oracle and SDK? **URL:** \ **Category:** ⚙️ Flow SDKs\ **Created:** [May 8, 2021, 2:51pm UTC](https://forum.flow.com/t/whats-the-difference-between-oracle-and-sdk/1890 "2021-05-08T14:51:56Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Fou](https://avatars.discourse-cdn.com/v4/letter/f/7ab992/32.png) [@Fou](https://forum.flow.com/u/Fou)\ **Post date:** [May 8, 2021, 2:51pm UTC](https://forum.flow.com/t/whats-the-difference-between-oracle-and-sdk/1890/1 "2021-05-08T14:51:56Z")
Hi all, I have a question about Oracle(e.g. ChainLink). I can also use for example flow-javascript-sdk or go-sdk to send “data” to Flow by making transactions. Then what’s the difference between using Oracle to write data to blockchain and using sdk? Thanks a lot! /Guisong ---
**Author:** ![flowjosh](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.flow.com/flowjosh/32/362_2.png) [@flowjosh](https://forum.flow.com/u/flowjosh)\ **Post date:** [May 11, 2021, 7:26pm UTC](https://forum.flow.com/t/whats-the-difference-between-oracle-and-sdk/1890/2 "2021-05-11T19:26:51Z")
An oracle is primarily a way to get reliable information from the real world onto a blockchain. Oracles often use some sort of voting and consensus to come to a conclusion on what information is accurate. An SDK is the programmatic interface to the blockchain, so it is what you use to submit transactions, scripts, and contracts. I could almost guarantee that the oracles are using an SDK to interact with the blockchain to perform their operations! ---
**Author:** ![Fou](https://avatars.discourse-cdn.com/v4/letter/f/7ab992/32.png) [@Fou](https://forum.flow.com/u/Fou)\ **Post date:** [May 12, 2021, 8:07am UTC](https://forum.flow.com/t/whats-the-difference-between-oracle-and-sdk/1890/3 "2021-05-12T08:07:37Z")
Highly appreciate for your explanation Josh, it’s super clear 🙂