What is a Antivirus?

Antivirus, also known as anti-malware software, is a computer program used to prevent, detect and remove malware from either the computer files or the computer systems, from data files and programs that are infected with.

You should keep in mind, about the virus is a program that intentionally to harm or interfere with any application software or data. Therefore, protecting your computer system should be one of your top priorities in order to avoid having disturb while you using your personal computer or smart phones.

Some Important Components of Antivirus:

• Protection from infection by malware.
• Protection against web browser harness or exploits.
• Checking, recognizing and blocking the malicious activity on your computer.
• Inspection and isolation of software that may be performing a secret activity.
• Protection from sneaking the files and recording the system activity. 
• Protection against slowing the operation of the computer and eventually crash by filling all available hard disk space.
• Prevention against to operating system integration and substituting the critical files with corrupt and malicious versions.
• Protection against to divulging or disclosing your sensitive information by using luring an internet user into a bogus transaction.
• Providing a network security over internet.
• Must have a ability to scan inbound and outbound email for infected attachments and URLs to malicious websites.
• Instant-Messaging protection against interruption from latching onto your computer files.
• Script blocking against to intended suspicious action by using VB or JavaScript.
• Auto-clean or quarantines.  

Different Symptoms of an Infected Computer:

• Your computer crashes or freezes frequently.
• The disk tray of your optical drive open and close unexpectedly.
• You hear unexpected sounds, played at random.
• Programs start unexpectedly.
• Your friends tell you that they have received messages from your instant messaging and you haven’t sent them anything.
• Something very much like a icon bouncing on your screen monitor after the operating system loaded.
• The harddisk LED continuosly blinking.
• The floppy disk drive (Obsolete) frequently operating itself, but no diskette has been inserted.
• There are lots of system error messages.
• You notice that files or folders have been deleted or distorted.
• Your web browser behaves inconsistently.
• Your printer does not print correctly or partially printed.
• You cannot open all your image files.
• You cannot use your format function of Windows.

REFERENCES:

• https://en.wikipedia.org/wiki/Antivirus_software
• http://www.online-sciences.com/technology/the-advantages-and-disadvantages-of-anti-virus-software/
• http://www.ehow.com/list_6150677_advantages-antivirus.html
• http://anti-virus-software-review.toptenreviews.com/must-have-features-in-antivirus-software.html
• http://www.kaspersky.com/au/symptoms
• http://computersupportservicesnj.com/top-10-computer-virus-symptoms-checklist/