What is a SKU?

Definition of a SKU and why it's important to e-commerce

Stock Keeping Unit

SKU stands for Stock Keeping Unit. SKUs are Wayfair’s unique way of cataloging products in our database. Each SKU is a combination of letters and numbers that identify characteristics about each product, such as manufacturer, brand, style, color, and size.

Types of SKUs

  1. Standalone Product: Can only be sold alone, not as part of a composite.
  2. Composite: A SKU that is made up of multiple parts (components) with their own part numbers and fulfillment information.
  3. Sellable Component: A product that can be sold alone and as part of a composite.
  4. True Component: A product that cannot be sold alone, and it must be sold as part of a composite.

An example of a composite product would be a bed, while the rails would be a true component and the headboard would be a sellable component (if also sold separately from the bed).


An example of a standalone product would be a light fixture.

How to Create a SKU

During the SKU Addition step, suppliers will upload product information like product identifiers, specs and bundling info, as well as add product details and descriptions, images, videos and guides. Top-notch content and media helps your assortment standout on site.

Wayfair makes the SKU Addition process easy by providing you with different options to upload your product information, including offering an Item Spec Sheet and an Item Spec Sheet Guide which provides detailed instructions for using the spreadsheet to upload all product information at once, including basic information (e.g. name, price, images, etc.) and class-specific details, for products in up to 15 different classes.

Ready to upload your SKUs with Wayfair? Apply to sell.