The Surface Pro pioneered the idea of the detachable 2-in-1, in which the base unit is a tablet you can use with an optional pen, but a TypePad cover turns the unit into a laptop.

A few years back, I thought such machines might gain a corporate niche with vertical tablet applications, but mostly those applications are now run on larger-than-ever smartphones. Along the way, the Surface Pro 3 moved up to a 12.3-inch display, which is smaller but higher-resolution than even smallest enterprise laptops. Instead the big attraction has been the extremely lightweight devices.
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https://in.pcmag.com/news/139970/living-with-a-microsoft-surface-pro-7