Product variant
Also known as: Variant
In short
A specific version of a product that differs in an attribute such as size, color or material and can be offered separately.
Represent the option a shopper can buy
A product variant is a concrete choice within a product family. The family supplies shared context; the variant identifies the combination the customer selects. Prices, images and availability can differ between those combinations.
In Google Merchant Center, variants are submitted as separate products with unique item IDs. A shared item_group_id connects the related variants. It is a group identifier, not a substitute for each item’s own ID.
Grouping needs to reflect the product and landing page experience. Unrelated products do not become variants because they share a brand, promotion or category.
Illustrative example
Imagine a shirt offered in two colors and three sizes. If every combination is sold, the family has six variants. The small green shirt and the large green shirt each need their own stock status, even though they share an image.
A shopper clicking the large green offer should arrive at a page that clearly represents that choice. Showing the price or availability of a different size creates a mismatch.
Avoid confusing grouping with segmentation
Variants describe versions of one product. A marketing segment can group unrelated items using margin, season or performance. Keep those structures separate so inventory identifiers, variant relationships and campaign rules each retain a clear meaning.