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Laptop  -  usually referred to mid-size unit that weight from anywhere from 4 to 8 pounds. 

It should have internal CD/DVD drives, might have  a floppy drive. Keyboard and screen are considerably bigger than in mini laptops. Screen will be anywhere from 15 to 17".

Counting by the components,  desktop and laptop computers are very similar - you'll find the same basic hardware in both, the most difference is in sizes and design layout.

Everything in laptop should fit in small form. Screen and keyboard are usually the biggest contributors to the size, after all, the screen size is the parameter by which you will judge the whole system at first glance. 

You'll also notice that keyboard is somehow different from that in desktop, it uses less keys. Sometimes special keys are not duplicated on both sides of the layout. There is no separate numeric keypad, so designers usually embedding  them under other keys, so you have to active it (reassign the keys) before you can start using them, otherwise you can easily use numeric keys which are in the second row from the top.

In the recent couple of years manufacturers start using the wider screens with the aspect ratio of 16x9 which is suited for HD-TV. This makes laptop chassis wider and consequently, the keyboard less crampy.

Still, if you want use the standard (desktop) layout keyboard, in many cases you'll be able to connect it to the laptop computers via mini-DIN port.

Only 2.25 MHz was  the processor speed for Univac - Universal Automatic Computer. The weight was 16,000 pounds, and it contained about 5,000 vacuum tubes.  Wondering what it looked like? Click here. Modern computer laptops would be considered then an alien from the outer space.