> For the complete documentation index, see [llms.txt](https://docs.langstack.com/welcome/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.langstack.com/welcome/get-started/learn-langstack/basics-and-essentials/what-is-an-entity.md).

# What is an Entity?

* Langstack applications support Entities to store data.
* Using the Entity template, users can create database entities to store, display and access data.
* Users may create an Entity by defining the fields for the entity.
* An Entity may be created, updated, copied, or deleted.
* Users can define two (2) types of relationships between Entities:
  * One-to-One (1-to-1): One Parent Entity can be related to One Child Entity
  * One-to-Many (1-to-M): One Parent Entity record can be related to multiple child records in another Entity.
* An Entity may be configured with a Validation pipeline for data creation or update. The Validation pipeline serves as a series of checks before the data is stored in the target Entity.
* Triggers can be added and configured to perform operations when data is created, updated, or deleted in an Entity.
* Data within Entities can be accessed independently and through Langstack applications such as APIs, Flows, and ETL pipelines.

## How to create and work with an Entity

To create an Entity:

* Click on Database>Entity database on the left side panel.

{% embed url="<https://media.langstack.com/documentation/media/images/code/training_manual/chapter_2/ch2whatisanentity_entitydatabaseinmenu.png>" %}

* Click on the \[+ Entity] button.

{% embed url="<https://media.langstack.com/documentation/media/images/code/training_manual/chapter_2/ch2whatisanentity_addentity.png>" %}

* Add and define relevant fields.
* Click the \[Save] button.