Cortana is a digital assistant bundled with Windows 10. You can ask Cortana to look up information using your speech. If you are running Windows 10 Fall Creators Update, Cortana comes with a "Pick up where I left off" feature. When enabled, it allows some of the apps you were running during the previous session to be restored automatically. When you switch between computers, Cortana can show quick links in the Action Center in order to help you reopen web sites and online documents that you were working on previously. If you find no use for this feature, or if you are annoyed by apps that relaunch automatically, you can disable it.