Thinkpad, laptop and notebook, mean virtually the same thing. i.e. portable computer. (thinkpad is a range of laptops by I.B.M now Lenovo).
A tablets interface is normally by an electronic stylus (pen/pencil), used to touch different parts of the "tablets" screen, to open and use appliances, and is a great boon to budding artists, who can draw freehand with the stylus, instead of being hindered by the useage of a mouse.