They're broadly similar to Workspaces, except you can also apply different panel and desktop configurations to each Activity. From KDE: "Activities are a super-

They're broadly similar to Workspaces, except you can also apply different panel and desktop configurations to each Activity. From KDE: "Activities are a super-set of Virtual Desktops. They don't replace Virtual Desktops -- in fact, each Activity can have its own set of Virtual Desktops if you choose. Instead, Activities are alternative desktops, each of which can have its own wallpaper, icons, and widgets."