Hi, Tia!
In that area you would not use keywords. Only a brief description. Something that says what the product is, without repeating the products actual description too much. For an example, let's say you are selling dog collars. You have multiple colors of the same collar that a customer can choose. They also comes in several different sizes. Then a sample description could be something like:
High quality collars for dogs in multiple colors (red, green, pink, purple) and sizes (xm, sm, m, l, xl, xxl) Made in the USA Matching leashes available.
Of course your actual product description would be more detailed and would paint a better picture of what you are selling. The description in the SEO shoud be brief no more than 150-200 characters are needed.
