# What Is Infrastructure as Code

**URL:** <https://discourse.sst.dev/t/what-is-infrastructure-as-code/161>\
**Category:** Chapter Comments\
**Created:** [May 9, 2018, 11:11pm UTC](https://discourse.sst.dev/t/what-is-infrastructure-as-code/161 "2018-05-09T23:11:40Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jayair](https://yyz2.discourse-cdn.com/flex032/user_avatar/discourse.sst.dev/jayair/32/9_2.png) [@jayair](https://discourse.sst.dev/u/jayair)\
**Post date:** [May 9, 2018, 11:11pm UTC](https://discourse.sst.dev/t/what-is-infrastructure-as-code/161/1 "2018-05-09T23:11:40Z")

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Link to chapter - [https://serverless-stack.com/chapters/what-is-infrastructure-as-code.html](https://serverless-stack.com/chapters/what-is-infrastructure-as-code.html)

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**Author:** ![wibek](https://yyz2.discourse-cdn.com/flex032/user_avatar/discourse.sst.dev/wibek/32/1249_2.png) [@wibek](https://discourse.sst.dev/u/wibek)\
**Post date:** [November 26, 2021, 11:20am UTC](https://discourse.sst.dev/t/what-is-infrastructure-as-code/161/2 "2021-11-26T11:20:06Z")

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The first line on this page says SST converts to CloudFormation.  
The page " Set up the Serverless Framework" says: " While we use [AWS CDK](https://serverless-stack.com/chapters/what-is-aws-cdk.html) in SST."

So now I’m confused. Is SST using AWS CDK or CloudFormation?

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<div class="post-metadata">

**Author:** ![jayair](https://yyz2.discourse-cdn.com/flex032/user_avatar/discourse.sst.dev/jayair/32/9_2.png) [@jayair](https://discourse.sst.dev/u/jayair)\
**Post date:** [November 26, 2021, 6:51pm UTC](https://discourse.sst.dev/t/what-is-infrastructure-as-code/161/3 "2021-11-26T18:51:50Z")

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SST uses CDK internally, which then gets converted to CloudFormation.