# Overview

## Concepts

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

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

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

## Concept Hierarchy

![](https://362399110-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LqPPgcuCulk4PnaI4Ob%2Fsync%2Fcd77f27cc4563f8f952f9e956661c5651665d8e9.png?generation=1605508237712272\&alt=media)

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.