There is nothing is laugh dude. Your question is valid. But a change. There are 4 of its kinds viz: Laptops, Notebooks, Tablet PC's and Desktop replacements. 'Thinkpad is not a classification, but a brand nameof Lenovo Laptops.
Laptop PCs are portable computers that combine a flat screen, keyboard and pointing-device in a single, lightweight unit. They are designed to run off (internal) batteries or connected to AC power. Depending on the design, they will either include built-in media devices such as CD or DVD drives and disk drives or support the connection external devices.
Notebook PCs are considered to be smaller and lighter than laptops, but the terms are becoming interchangeable in general usage.
This class of product also includes the "Tablet"PC: a portable PC that includes a touch-screen display and operating system modified to recognize hand-written input. It may be used in either tablet (touch-screen) or laptop (keyboard) mode.
Check out more at *en.wikipedia.org/wiki/Laptop