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41 lines
2.1 KiB
Plaintext
41 lines
2.1 KiB
Plaintext
---
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title: Segments
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---
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:::info Availability
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Strategy constraints are available to Unleash Pro and Enterprise users from Unleash 4.10 and onwards.
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:::
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A **segment** is a reusable collection of [strategy constraints](../advanced/strategy-constraints.md).
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Like with strategy constraints, you apply segments to [feature toggle activation strategies](../user_guide/activation-strategies.md).
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You can apply the same segment to multiple activation strategies.
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If you update the segment, the changes will affect every strategy that uses that segment.
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## Structure and evaluation
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Segments are collections of strategy constraints. To satisfy a segment, *all* the constraints in the collection must be satisfied.
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If an activation strategy has a segment *and* additional constraints applied, the segment *and* the strategies must all be satisfied.
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## Creating, updating, and deleting segments
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Segments can be created, edited, and deleted from the segments page in the admin UI or via the API (see the [segments API documentation](../api/admin/feature-toggles-api-v2.md)).
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A segment that is in use **cannot** be deleted. If you'd like to delete a segment that is in use, you must first remove the segment from all the activation strategies that are currently using it.
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[image of the segments page and the segments item in the menu?]
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## When to use segments
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Segments let you create user groups based on data available in the Unleash context.
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These groups can be as simple or complex as you want to make them.
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You could, for example, use segments to target:
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- Users in a specific region
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- Users on a specific device type
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- Users who signed up before a specific point in time
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or any combination thereof. Because segments stay in sync across strategies, any changes will propagate to all the activation strategies that use them.
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If you need to keep time-based feature availability in sync across, you can use segments to achieve this too. For instance, you could create a "Black Friday" segment which is only satisfied on that specific Friday and use that to synchronize the availability of a number of related features.
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