Malware is the short form malicious software. We are users that consider virus is called malware. There are many forms of malware such as virus, worm, Trojan, and spyware. Generally malware means which is used to detriment others.
Virus is made of some combination of the code that has been worked after install the code related software. If virus has been attacked your computer then it will attack your all important file and disable your operating system. Generally USB drive, download from internet, email and others system your computer may be attacked by virus.
It is most irritating threat for the present time. Adware is the group of application or software that has came your computer. Generally during download for our fault we download another instead of other. For this cause most of the time for adware download, adware download button has been checked and those download page has more than one download button.
Trojan and backdoors:
The history of Trojan horse is closely related to Trojan virus. Trojan virus has been performed same way. It entered your computer through backdoors and then tries to connect with your server. When it succeeds then backdoor has been opened for control your PC. That means hacker can control your pc from remote place and they capture your important information. But after attacked if you can understand that your PC has been attacked by Trojan virus than you can save if you turned off internet connection and they are unable to capture your information. You can easily remove Trojan through Trojan virus.
From the name of spyware we can get some ideas about its performing. Although most of the spywares are not comparatively detrimental but in sometimes it may be a great security risk. Spyware mainly focus your internet surfing and relates with add related issue. Sometimes spyware has become detrimental than Trojan horse.