A "Borderless Window" is a type of user interface design that allows applications to be displayed without traditional window borders or title bars. This design creates a more immersive experience by enabling users to focus on the content rather than the window's frame. It is commonly used in modern software applications and gaming environments. This approach enhances multitasking by allowing users to easily overlap and arrange multiple applications on their screens. It is often associated with user-friendly operating systems like Windows and macOS, which support various customization options for managing open applications efficiently.