What are the key differences between Windows 10 and Windows 8.1 in terms of user interface?

Windows 10 and Windows 8.1 have some notable differences in terms of user interface. Here are some of the key differences:

• Start menu: In Windows 8.1, the start menu was replaced by a start screen with a tile-based interface. In Windows 10, the start menu was reintroduced, combining the traditional start menu with live tiles from the start screen.
• Action Center: Windows 10 features an Action Center in the taskbar, which provides quick access to notifications and settings. Windows 8.1 has a similar feature, but it is accessed through the Charms bar.
• Task View: Windows 10 includes a Task View button in the taskbar, which allows users to quickly switch between open windows and virtual desktops. This feature is not available in Windows 8.1.
• Cortana: Windows 10 includes Cortana, a digital assistant that can help users with tasks such as setting reminders and searching for information. This feature is not available in Windows 8.1.

Overall, while both Windows 10 and Windows 8.1 share some common features and design elements, Windows 10 offers several new features and improvements to the user interface that make it a more user-friendly and versatile operating system.