Silk is a platform for sites that contain collections of information. It's like the Tumblr for websites that have structured content–like software reviews, information about designers, a site with UN datasets, and more.
When you have created your site (manually or by uploading one or more datasets), you can visualize and filter your data in a few ways. You can create graphs if your pages contain numbers, maps if you have locations, and filtered tables for just about anything. These visualizations and tables are interactive: anyone can play around with the variables to get the answer they need from the data.