Optional diagnostic data includes additional details about your device and its settings, capabilities, and device health. Optional diagnostic data also includes information about the websites you browse, device activity (sometimes referred to as usage), and enhanced error reporting. Optional diagnostic data can also include the memory state of your device when a system or app crash occurs (which may unintentionally include parts of a file you were using when a problem occurred). Required diagnostic data will always be included when you choose to send Optional diagnostic data. While your device will be just as secure and operate normally when only sending Required diagnostic data, the additional information we collect when you've chosen to send Optional diagnostic data makes it easier for us to identify and fix issues and make product improvements that benefit all Windows customers.

For more information, see aka.ms/winoptdd.