> For the complete documentation index, see [llms.txt](https://docs.kernel.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kernel.ai/concepts.md).

# Concepts

- [KERN ID](https://docs.kernel.ai/concepts/kern-id.md): Kernel's entity database is anchored on a unique, persistent ID that covers every entity of every kind.
- [Entity resolution](https://docs.kernel.ai/concepts/entity-resolution.md): Kernel's proprietary entity resolution mechanism intelligently matches records in your system record with Kernel's database similarly to how a human would do it - with full context
- [Hierarchy relation taxonomy](https://docs.kernel.ai/concepts/hierarchy-relation-taxonomy.md): How Kernel labels each account's position in its corporate tree.
- [Feedback loop](https://docs.kernel.ai/concepts/feedback-loop.md): Kernel's feedback loop lets your team flag data issues from Salesforce or the Kernel app and track them through to resolution by the Kernel data team.