# What & Why

- [What is Scanner](/scanner/what-and-why/readme.md): Scanner is the world’s fastest, easiest, and most scalable Security Data Lake. It lets you keep unlimited logs in your own Amazon S3 buckets and adds hyper fast search, detection, alerts, APIs & more.
- [How it Works](/scanner/what-and-why/how-it-works.md)
- [How Scanner Achieves Fast Queries](/scanner/what-and-why/how-it-works/how-scanner-achieves-fast-queries.md)
- [Detection Rule Engine](/scanner/what-and-why/how-it-works/detection-rule-engine.md)
- [Bring Your Own Cloud (BYOC) / Self-Hosted](/scanner/what-and-why/how-it-works/bring-your-own-cloud-byoc-self-hosted.md)