> For the complete documentation index, see [llms.txt](https://developer.harness.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.harness.io/harness-platform/use-harness-platform/references/harness-entity-reference.md).

# Harness entity reference

The term entity is used to refer to the components of Harness. Most entities can be created at the account, organization, and project level.

#### Examples of Entities <a href="#examples-of-entities" id="examples-of-entities"></a>

Here are some example of entity types in Harness:

* Account
* User
* Users Group
* Service
* Service Definition
* Environment
* Infrastructure
* Infrastructure Definition
* Pipeline
* Connectors
* Secrets
* Secret Managers

#### Entity Identifiers <a href="#entity-identifiers" id="entity-identifiers"></a>

Most Harness entities and resources include a unique Id (Identifier) that is immutable once the entity is created.

Identifiers provide a permanent way to refer to an entity, and avoid issues that can arise when a name is changed.

See [Entity Identifier Reference](/harness-platform/use-harness-platform/references/entity-identifier-reference.md).

#### See also <a href="#see-also" id="see-also"></a>

* [Entity Identifier Reference](/harness-platform/use-harness-platform/references/entity-identifier-reference.md)
* [Entity Retention Policy](/harness-platform/use-harness-platform/references/entity-retention-policy.md)
* [Entity Deletion Reference](/harness-platform/use-harness-platform/references/entity-deletion-reference.md)