1. Windows 7
1.1. Strengths
1.1.1. Most popular operating system
1.1.2. Easy to use, Applications & driver support
1.2. Weaknesses
1.2.1. Doesn’t come pre installed with good applications
1.2.2. Not free, restricted, no freedom
1.3. Newhttp://blog.hafees.com/windows/windows-linux-and-mac-a-comparison/ node
2. Linux: Ubuntu
2.1. Strengths
2.1.1. Plenty of flavors optimized for different tasks like multimedia.
2.1.2. Excellent community, especially Ubuntu has excellent community support. So if you ran into a problem, just seek help from the community.
2.2. Weaknesses
2.2.1. May be difficult to decide which Linux flavor.
2.2.2. Lack of high quality professional software
2.3. http://blog.hafees.com/windows/windows-linux-and-mac-a-comparison/
3. OS Definition
3.1. the collection of software that directs a computer's operations, controlling, and scheduling the execution of other programs, and managing storage, input/output, and communication resources.
3.1.1. http://dictionary.reference.com/browse/operating+system
4. Apple, OS X
4.1. Strengths
4.1.1. Excellent user interface and usability
4.1.2. Applications – A large number of excellent professional applications are available in this platform and hence preferred by designers and other professionals
4.2. Weaknesess
4.2.1. Though, based on open source operating systems, it is still proprietary
4.2.2. The Operating system is limited to a specific platform
4.3. http://blog.hafees.com/windows/windows-linux-and-mac-a-comparison/
5. google chromium
5.1. Strengths
5.1.1. Speed, simplicity and security are the key aspects of Google Chrome OS
5.1.2. searching for information, checking email, catching up on the news, shopping or just staying in touch with friends
5.2. Weaknesses
5.2.1. It is "cloud computing based" and can be "claustrophobic"
5.2.2. Will only run on specifically designed hardware