What’s a detachable 2-in-1 device?
Your Windows 2-in-1 device has a detachable keyboard/trackpad. With the keyboard attached you can use it like a laptop or remove the keyboard to operate as a pure tablet device. Some models of detachable 2-in-1 devices have a reversible display which allows you to reattach the keyboard behind the display in tablet mode enabling 2 extra modes: stand and tent.
Detachable 2-in-1 devices tend to be more popular amongst users who favour a tablet configuration for mobile and casual use, but sometimes need the laptop experience for certain productivity tasks.