1. Ram
1.1. RAM (random access memory) is the place in a computer where the operating system, application programs, and data in current use are kept so that they can be quickly reached by the computer's processor.
2. Open Source
2.1. Generically, open source refers to a program in which the source code is available to the general public for use and/or modification from its original design free of charge, i.e., open.
3. Operating Systems
3.1. The operating system is the most important program that runs on a computer. Every general-purpose computer must have an operating system to run other programs.
4. Market Share
4.1. The percentage of an industry or market's total sales that is earned by a particular company over a specified time period.
5. Windows 8
5.1. Pros
5.1.1. Launch Pad – introduced to OS X Lion, as mentioned in the previous section – is an app itself that you launch from the Dock.
5.1.2. The Start Screen is an excellent app launcher
5.2. cons
5.2.1. the Start Screen does infinitely more than the Launch Pad but to say it does it well is somewhat of a personal preference.
5.2.2. Files can be searched from the Start Screen but folders cannot,
6. Mac OS X
6.1. Pros
6.1.1. The biggest advantage of Windows is that it provides ready-made solutions that can be implemented by just about anyone who’s ever used a computer.
6.1.2. Finally, software services are in large supply when it comes to Windows.
6.2. Cons
6.2.1. The biggest one is price
6.2.2. more need for software services when it comes to Windows.
7. Ubuntu 12.10
7.1. Pros
7.1.1. Ubuntu 12.10 benefits from a user interface that has been in the wild for more than a year.
7.1.2. Ubuntu already had a built-in cloud storage system — UbuntuOne.
7.2. Cons
7.2.1. However, the change hasn’t been without criticsm from Ubuntu users – especially long-term Ubuntu useres many of which have used Ubuntu for years. Many people that do not like the new Unity user interface often complain(ed) about the lack of customisability of the user interface and the menu bar at the top
7.2.2. Ubuntu is still not as user friendly as Windows is. Primarily because if you have a problem with Ubuntu, sometimes it requires using the Terminal which isn’t a good start for someone who may not understand what the Terminal is nor what to do.