Antivirus programs assist in the protection of the computer system from bad malware like worms, viruses, Trojan horses, etc. Once these invaders enter into your computer system, they carry out malicious actions such as going through personal information, deleting relevant documents and important data, and also using your computer as a host to attack other servers and computers.

Until electronic appliances, such as a television or a computer or a laptop or tablet or your pocket mobile phone, are in existence and whether the appliance is connected to the Internet or not, they are prone to being attacked by viruses that are mentioned above.

An antivirus software therefore is very much necessary in preventing such a threat; in order to safeguard personal data, documents and activities conducted using the system. Although it is a known fact that all cyber-attacks and cyber terrorism cannot be prevented using an antivirus, an antivirus software uses effective tools to avoid malware invasion of your computer system.

Although every invasion that occurs may not be causing any sort of irreparable damage, once an invasion or intrusion takes place, it creates a chaos in the working of the computer. An intrusion or invasion into a computer system shows that the computer’s operating system or any other related software are weak and can be attacked by trojans and worms which can enter the computer system and affect the data in it. Sometimes when virus invasion takes place in your computer system, it may open up a tunnel for an attack on other computers.

While choosing from the plethora of antivirus software available in the market, one should purchase an antivirus software that is trustworthy and is subscription-based software. If the user buys a subscription-based antivirus program than the creators of the antivirus programs will protect the subscriber’s computer system by notifying them of the vulnerable threats they are prone to.

An antivirus software program, as the name suggests, not only performs the function of blocking viruses from entering into the computer system but also has many other functions. Below mentioned is a list of all the necessary protection functions carried out by an antivirus software program.

The most basic function of an antivirus software program is to protect the computer system from the malicious virus and their attacks that are meant to damage the computer as well as the data that it holds.

Rootkits are embedded deep within a computer which are meant to cover the malware from establishing itself into the computer system. An antivirus software program provides prevention of rootkit.

The subscriber of the antivirus software program, through the bot protection feature, is notified about a remote cybercriminal who is trying to invade their computer system and use it as a source of spamming and carrying out other cybercrimes. Bots are based on botnets. These are clusters of ordinary computer systems that have been attacked for the purpose of carrying out other malicious activities in their disguise.

A worm usually targets a network instead of a computer system. Such worms carry a lot of malware along with them which eventually affects the computer system connected to the network. Antivirus software programs will prevent such attacks caused by the worms.

Antivirus programs can’t decide whether or not the program which has been downloaded is legitimate unless and until it is scanned. At the most, the antivirus can notify the user about an existing malware in the Trojan file that has been downloaded.