Linux
Open-source is a development model. Windows is an operating system.
An operating system is a necessary concept of using a modern computer. It is not a matter of "popularity."
This varies widely from one OS to another. As with many other things it is commonly whatever the market will bear, as in general a computer without an operating system won't do much useful work. However there are opensource OSs (e.g. Linux, OpenVMS) that can be obtained free or at very low cost.
Operating system development as a hobby has a large cult-like following. As such, operating systems, such as Linux, have derived from hobby operating system projects. The design and implementation of an operating system requires skill and determination, and the term can cover anything from a basic "Hello World" boot loader to a fully featured kernel. One example of this is the Minix Operating System-an OS that was designed by A.S. Tanenbaum as a teaching tool but was heavily used by hobbyists before Linux eclipsed it in popularity.
An operating system is / was called a "disk" operating system because it was stored on a floppy disk or hard drive, as opposed to either being embedded in a ROM chip (like early versions of Mac OS were), or stored on a cartridge, cassette, tape reel, or some other storage medium. The usage fell out of favor due to the popularity of MS-DOS: "DOS" was thereafter used to refer only to MS-DOS or compatible operating systems.
In order of popularity: Windows XP Windows Vista Mac OS X Linux FreeBSD Solaris HP-UX
Multiprocessor systems have gained popularity over the years as they allow the user to do more than they could with a single processor system. Xbox 360, CELL, and Sequent are examples of multiprocessor systems.
XP is a complete operating system, not simply an operating environment.
There are basically four types of operating systems. They include Batch Operating System, Multiprogramming Operating System, Network Operating System and Distributed Operating System.
1. BATCH PROCESSING operating system 2. MULTIPROGRAMMING operating system 3. TIME SHARING operating system 4. REAL TIME operating system 5. DISTRIBUTED operating system
An operating system manages the working operation of a computer
Yes, a multiuser operating system is also described as a network operating system.