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

# Core Concepts

- [What Is growthepie?](https://docs.growthepie.com/core-concepts/what-is-growthepie.md): Plain-English definition of growthepie and what growthepie data covers.
- [What Is origin\_key?](https://docs.growthepie.com/core-concepts/what-is-origin-key.md): Learn what origin\_key means in growthepie and where to find valid origin\_key values.
- [What Is owner\_project?](https://docs.growthepie.com/core-concepts/what-is-owner-project.md): Learn what owner\_project means in growthepie and where to find valid owner\_project values.
- [What Is metric\_key?](https://docs.growthepie.com/core-concepts/what-is-metric-key.md): Learn what metric\_key means in growthepie and how metric\_key differs from metric\_id.
- [Chain vs App vs Ecosystem Metrics](https://docs.growthepie.com/core-concepts/chain-vs-app-vs-ecosystem-metrics.md): Understand the difference between chain metrics, app metrics, and ecosystem context in growthepie.
- [Time Granularity, Freshness, And Update Cadence](https://docs.growthepie.com/core-concepts/time-granularity-freshness-and-update-cadence.md): Learn how growthepie uses daily, weekly, monthly, quarterly, and hourly data across endpoints.
- [How To Interpret Values, Units, And Dates](https://docs.growthepie.com/core-concepts/how-to-interpret-values-units-and-dates.md): Learn how to interpret value, units, currencies, timestamps, and dates in growthepie responses.