Malware or malicious software is the term given to software that is intrusive and hostile and deliberately created to cause havoc to a computer system. The intention behind the malware is to gain access to a specific computer to collect personal and financial information. Malware can be created in different forms which are below mentioned:

Viruses:
It is the most common form that can be transmitted to any computer by an e-mail having an infected attachment. The computer can also get infected by any device that is used on several computers like flash drive. The result of this attack may vary from slowing down your computer to deleting all the important files, depending on the functioning of the virus.

Worms:
It is another kind of malware that is ultra simple in comparison to virus. Worms can also self-replicate like virus but unlike the latter one which can move between machines, the worm can attach to network traffic to infect several computers simultaneously. The degree of the damage is severe as apart from deleting crucial files it also opens a backdoor for a hacker to take control on the infected computer.

Trojan Horses:
One of the most perilous forms of malware that looks like an undisrupted attachment or a bit of software in the beginning but after installing it to your computer, it can drop off worms, viruses or spyware. As it does not possess the ability of self-replication, the software engineers do not categorize it as a virus.

Spyware:
Spyware instead of imposing damage to your computer; tracks and reports all your activity without your approval. It can be easily installed to your computer with any software having a secret spyware in it. The clear indication that your system is infected with spyware is the repeated flaunts of pop-ups, redirect from your search engine and unexpected change to your web browser.

Root kits:
Hackers use it as an effective tool to gain access to a particular computer that a system administrator has from a distant location. Root kits are complicated single or collection of programs that secure the identity of the hackers. Root kits infect those computers that are operated from a remote location. After getting infected, these computers attack other machines, steal passwords and distribute spam. Any effort to ascertain the hacker will direct back to the infected machine.

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