The product that you design should focus on a specific group of people. Thus, for example, a 'rollator' is aimed at older people, or people who may walk poorly. Such a group of people for which a product is made, is called a 'target group'.
You have worked with target groups before. Now go explore what products in a supermarket exist for specific target groups. Because you want to know if the product you are designing appeals to the group of people who should buy the product.