The term "ungated categories on Amazon" refers to products that are not restricted by the company's approval process. This means sellers don't need Amazon approval to sell products in these categories. Unlocked categories include generic products like clothing, groceries, health and beauty items, as well as niche products like sporting goods, toys, and pet supplies. Selling in non-delimited categories can be a great way for newer sellers to get started on Amazon, as it allows them to sell products without having to go through the approval process. However, competition in these categories can be fierce. Therefore, in order to be successful, sellers must offer quality products and excellent customer service.