> For the complete documentation index, see [llms.txt](https://docs.feast.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.feast.dev/v0.11-branch/feast-on-kubernetes/concepts/overview.md).

# Overview

## Concepts

[Entities](/v0.11-branch/feast-on-kubernetes/concepts/entities.md) are objects in an organization like customers, transactions, and drivers, products, etc.

[Sources](/v0.11-branch/feast-on-kubernetes/concepts/sources.md) are external sources of data where feature data can be found.

[Feature Tables](/v0.11-branch/feast-on-kubernetes/concepts/feature-tables.md) are objects that define logical groupings of features, data sources, and other related metadata.

## Concept Hierarchy

![](/files/-McwVhgp90soyy8xkucL)

Feast contains the following core concepts:

* **Projects:** Serve as a top level namespace for all Feast resources. Each project is a completely independent environment in Feast. Users can only work in a single project at a time.
* **Entities:** Entities are the objects in an organization on which features occur. They map to your business domain (users, products, transactions, locations).
* **Feature Tables:** Defines a group of features that occur on a specific entity.
* **Features:** Individual feature within a feature table.


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