You can differentiate an article in up to 3 variants. These can be e.g. the size or color or dimensions the width or height. There are no limits here. An article in 3 colours and 5 sizes then comprises a total of 15 variants or SKUs (Stock Keeping Units).
Here is an example with a single variant – a pair of jeans in different sizes:
Here an example with 2 variants – one jeans in different sizes and lengths:
Here is an example with 3 variations – one jeans in different sizes, lengths and colours: