[Ducky]

Some Tablets come with, or have optional, keyboard accessories. essentially turning them into a laptop. The Asus Transformer Prime being a good example of that. (The iPad also has many 3rd party options)

The tabled clips into the keyboard making it look pretty much exactly like a laptop. This makes it pretty useful. When you want a keyboard, take it with you, when you want a smaller device for doing simple thing take off the keyboard. The best of both worlds.
The Prime also happens to be one of the most graphically powerful tablets out there, and probably one of the top tablets in regards to over specs. the only draw back being the obvious high price.