To let Cortana do her best work, Microsoft collects and uses information including your location and location history, contacts, ...

To let Cortana do her best work, Microsoft collects and uses information including your location and location history, contacts, voice input, searching history, calendar details, content and communication history from messages and apps, and other information on your device. In Microsoft Edge, Cortana collects and uses your browsing history. You can always tinker with what Cortana remembers in the Notebook, disable Cortana in Microsoft Edge, or turn Cortana off entirely.