You can add variants to a product that comes in more than one option, such as color or size. Each combination of options for a product is a variant for that product.
For example, if you sell T-shirts with two options: color and size.
The color has two values: red,blue.
The size option has two values: small, large.
The specific variant from these options is a small, red, T-shirt.
You can view the list of a product variants on the product details page
Note: When you add variants to a product, it changes the way the product detail is set. For products without variants, you can set the Pricing, Inventory, and Shipping settings from the product detail page. After you add variants, you need to adjust settings for each variant from the Inventory page.
Each product can have up to 3 options. The options can vary from product to product.
For example, one product can use size, color, and style, while another product can use weight, finish, and material.
How to add a product variant: