# Tagging Amazon OpenSearch Serverless collections
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Tags let you assign arbitrary information to an Amazon OpenSearch Serverless collection so you can categorize and filter on that information. A *tag* is a metadata label that you assign or that Amazon assigns to an Amazon resource. 

Each tag consists of a *key* and a *value*. For tags that you assign, you define the key and value. For example, you might define the key as `stage` and the value for one resource as `test`.

With tags, you can identify and organize your Amazon resources. Many Amazon services support tagging, so you can assign the same tag to resources from different services to indicate that the resources are related. For example, you could assign the same tag to an OpenSearch Serverless collection that you assign to an Amazon OpenSearch Service domain.

In OpenSearch Serverless, the primary resource is a collection. You can use the OpenSearch Service console, the Amazon CLI, the OpenSearch Serverless API operations, or the Amazon SDKs to add, manage, and remove tags from a collection.

## Permissions required
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OpenSearch Serverless uses the following Amazon Identity and Access Management Access Analyzer (IAM) permissions for tagging collections:
+ `aoss:TagResource`
+ `aoss:ListTagsForResource`
+ `aoss:UntagResource`