# Libraries & Dependencies
Libraries are **specialized items** that are not visible in the Storefront. Instead, they are available for other publishers to reference inside their scripts.
### Creating a Library
Creating a library works the same way as creating a script (see[Step By Step Guide](/publishing-tool/step-by-step-guide.md)).
The only difference is that a library requires a **Library ID**.
* The Library ID is a unique identifier used by scripts to reference your library.
* Without it, other publishers cannot include your library as a dependency.
You can create and assign a Library ID in the **General** tab:
Once published and approved, your library becomes available for others to use as a dependency.
### Referencing Libraries
When your script references a library, the library is automatically loaded alongside your script at runtime.
To add a library dependency:
1. Go to the **Dependencies** tab.
2. Click **Add dependency**.
3. Find the library you want to reference and click **Add**.
4. The library will appear in your dependencies list.
It is recommended to reference a **specific version** of a library rather than always pulling the latest. This ensures your script continues to work even if the library author publishes breaking changes later.
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