In the 'Add a Site' section you are asked to mention a few of the most relevant categories that you would like your site to be listed under. For example, if you have an online shopping store selling mobile phones, you could enter these category preferences while adding your site: 'Shopping', 'E-commerce', 'Consumer Goods', or 'Electronics'.

However, you needn't worry about whether you've made the right choice of categories, as the details you enter will anyway undergo review, wherein one of our editors will check to see whether the categories selected are the most relevant and in keeping with the theme of your site.