What features are there on a laptop

Laptops are a definite need than a luxury, in today's fast paced world.
The processors or the CPU are one of the main components of a computer. The CPU contains the ALU that is the Arithmetic and Logic Unit and the Control Unit. The hard drive is the next component, which is of importance.
RAM is the component where the running applications and data is stored. It stands for Random Access Memory.
The screen used is LCD screens and this could be from 12" to 14" or even 15". The resolution is also to be considered. This could be 1024 x 768 for a standard screen, and can also increase, depending upon the type of screen used.
Graphic card are inserted into them to give laptops better display capacities.
Optical drives for CD/DVD playing is also necessary. The battery capacity is also to be checked. Mostly Lithium Ion batteries are used. They have a back up time from 2 hours to 5 years.
The wireless LAN facilities, Ethernet etc should also be available.