No. An operating system adds a interface and menu to a computer to make it easier to use, so you don't have to only look at command line.
A virus scanner/antivirus protects you from harmful software.
Some examples of antivirus software includes:
AVG
Avast!
Mcafee
Norton
Anti Virus Software
Be protected against and prepared for a ransomware attack: Keep your operating system and software up to date. Use strong passwords and multi-factor authentication. Back up your data regularly. Use a firewall and antivirus software. Stay current on identifying an attack and what emails, links, and downloads to avoid. Have a plan for how you will respond, including communication, containment, and recovery.
Antiware is a property management software. Antiware scans , reports cleans and protects against viruses.There are many brands of Antiware as property management software. They are mostly affordable and sufficient.
A Security Patch
"Some internet security suites scan downloads for spyware, viruses, and rootkits upon download and others focus their energy solely on antivirus protection upon program launch. It�۪s best to check the specific functions of the software before committing to any brand."
The ozone layer protects against sun's harmful rays. These are UV rays.
it sometimes blocks it but malaware you need anti-malaware software
The Ninth Amendment protects against unreasonable disturbances. The Fourth Amendment protects against unreasonable searches.
Most applications are available at your distribution's repositories, however depending on the kind of distribution, you may have the option to use user-created repositories that allow you to use applications or dependencies that offer features the official packages do not have, or that the official packages are not offered due to legal issues (some distributions have a strict policy against including non-free/proprietary software in their repositories).
Ozone layer protects against the UV rays. It is present as the ozone layer in stratosphere.
Mesosphere protects against them. It is the top layer.
Microsoft Security Essentials is antivirus software for Windows XP through Windows 7. It protects your computer against viruses, spyware, trojan horses and rootkits.