---
slug: core-concepts/collections
−section: Core Concepts
−order: 6
+section: Understanding Usable
+order: 7
status: published
description: "How collections curate related fragments and how they differ from types, tags, and workspaces."
---
··· 90 unchanged lines ···
- [Workspaces](/usable/core-concepts/workspaces) define the boundary in which a collection exists.
- [Fragment types](/usable/core-concepts/fragment-types) describe what each member fragment is.
- [Tags and summaries](/usable/core-concepts/tags-and-summaries) support reusable labels and discovery.
- [Search and retrieval](/usable/core-concepts/search-and-retrieval) explains when to search broadly or filter by a curated set.