> 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/data.md).

# Data

- [Entity data](https://docs.kernel.ai/data/entity-data.md)
- [Core entity data](https://docs.kernel.ai/data/entity-data/core-entity-data.md): The identity fields Kernel resolves for each real-world entity
- [Entity categories](https://docs.kernel.ai/data/entity-data/entity-categories.md): How Kernel classifies the type and role of each resolved entity
- [LinkedIn URL](https://docs.kernel.ai/data/entity-data/linkedin-url.md): How Kernel matches a resolved entity to the right LinkedIn company page
- [Hierarchies](https://docs.kernel.ai/data/hierarchies.md): How Kernel links entities into corporate trees
- [Parent relationships](https://docs.kernel.ai/data/hierarchies/parent-relationships.md): Immediate parent, top parent, top operating parent, and standalone entities
- [Regional subsidiaries](https://docs.kernel.ai/data/hierarchies/regional-subsidiaries.md): How Kernel distinguishes regional subsidiaries from duplicate accounts
- [Firmographics](https://docs.kernel.ai/data/firmographics.md): High-level guide to Kernel firmographic data and field-level explainers
- [Headcount](https://docs.kernel.ai/data/firmographics/headcount.md): How Kernel determines payroll-based headcount at entity and consolidated scope
- [Revenue](https://docs.kernel.ai/data/firmographics/revenue.md): How Kernel determines annual revenue, currency, source, and scope
- [Location](https://docs.kernel.ai/data/firmographics/location.md): Why Kernel separates operating and registered location
- [Operational status](https://docs.kernel.ai/data/firmographics/operational-status.md): How Kernel determines whether an entity is active, absorbed, out of business, or undetermined
- [Industry (custom)](https://docs.kernel.ai/data/firmographics/custom-verticals.md): Custom industry classification grounded in Kernel entity data and customer context
- [Data dictionary](https://docs.kernel.ai/data/data-dictionary.md): Every field Kernel resolves and enriches for a company, independent of any CRM