To make Knowledge articles available to site users, you need to map topics to data categories and enable the “Share on Sites” setting. Topics are labels that you can assign to articles to make them easier to find and organize. Data categories are away of classifying articles based on a predefined hierarchy. You can map topics to data categories, so that when you assign a topic to an article, it automatically inherits the data category visibility settings. The “Share on Sites” setting allows you to share articles with public users on your site.