website/content/en/docs/reference/glossary/annotation.md

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---
title: Annotation
id: annotation
date: 2018-04-12
full_link: /docs/concepts/overview/working-with-objects/annotations
short_description: >
A key-value pair that is used to attach arbitrary non-identifying metadata to objects.
aka:
tags:
- fundamental
---
A key-value pair that is used to attach arbitrary non-identifying metadata to objects.
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The metadata in an annotation can be small or large, structured or unstructured, and can include characters not permitted by {{< glossary_tooltip text="labels" term_id="label" >}}. Clients such as tools and libraries can retrieve this metadata.