> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.peak-pim.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# 🏷️ What are metafields?

Metafields are extra fields for storing custom information that doesn't fit Shopify's standard fields, such as a material, a care instruction or a size guide.

# How metafields work in Peak PIM

In Peak PIM, a **metafield definition** describes one of these custom fields:

* What it applies to: a `product`, a `variant` or a `collection`
* What type of information it holds (text, number, date, etc.)
* Which Shopify stores use it

Once a definition exists, you can fill in its value on individual products, variants or collections, then publish to send those values to Shopify.

||| Metafields are a powerful way to enrich your Shopify catalog and power custom theme features without changing your core product details.

👉 [Creating a metafield definition](https://help.peak-pim.com/en/article/creating-a-metafield-definition-4h0n6u/)