The document discusses Windows 10 and Windows 8.1. It provides information on the developer (Microsoft), release dates of each (Windows 10 in 2015, Windows 8.1 in 2013), and allowed some Windows users to upgrade to Windows 10 for free in the first year after its launch. It also lists some common issues users experience with each like not having enough space for Windows updates, slow boot times, and files opening in the wrong application.