Keeping this in view, what are product options?
A product option is used for products that come in different variations. Size and color are common examples of product options, but they can also be things like checkboxes or fields for custom text.
One may also ask, what is difference between SKU and product? The product is a more generic definition of something that is made available in your store, such as "Shirt". SKUs are the variations of this product. Products can vary by shape, color, size etc. In that case, you'll have 1 SKU for 1 product: for example, product "Shirt", with SKU "Shirt".
Also know, what is a product variation?
Product variations occur when an item that has different attributes, such as color and size, is grouped together with its variants on a single product page. The parent is the actual product, and children are the variants.
Do different sizes have different SKUs?
For instance, if you sell a shirt in 3 different sizes (Small, Medium, Large) and 3 different colors (Red, Green, Blue), each size and color combo would have its own inventory and therefore have its own SKU as well. A SKU is not the same as a product model number from a manufacturer or a UPC number.