What feature does Cortana provide in Windows 10?

Cortana in Windows 10 is a digital assistant designed to enhance productivity and user experience through voice interactions. One of its primary features is voice search capability, allowing users to ask questions, set reminders, manage tasks, and perform searches using natural language. This functionality enables a more intuitive and hands-free way to interact with the operating system, making it easier to access information or manage schedules without needing to manually type queries.

In contrast, other options focus on distinct functions that are not associated with Cortana. A file management system pertains to Windows File Explorer, a graphics editing tool would relate to applications like Paint or Photoshop, and an antivirus feature is linked to Windows Defender. These features serve different purposes and do not involve the voice-based, interactive capabilities that define Cortana's functionality.