What is a variant of a product ?

Variant of a product is an item, with predefined Size (and/or Color). I.e. if you have an item called Shirt, like a variants you can have also Shirt, size XL, other variant can be size L.
According to the variants that you set for a product, E-shop can display all or only those you wish.
In order to indicate a product with the variants, it must have a barcode. Then, may be published in e-shop, as do publish (from Menu Inventory), thereby publish all products in different variants which have the same barcode. If you want to publish / or remove / a version of the product (eg. a certain color or size), you can do it by choosing Edit product (from the Inventory, Red button) and from Detailed information about e-shop, check Published ..