The web is arguably a dangerous place with viruses, hackers, spyware, malware and phishing sites. A virus is a program that attaches itself onto a file and keeps multiplying as the file is being used. A virus can damage a device by using up all the memory space, slowing down the device and sometimes damaged it completely. It can also damage and destroy data files and make disks unreadable. Trojan viruses are designed to look like file and software that is safe to use. They don’t replicate like viruses but make a easy way for virus to infect the device. The Trojan virus can block, delete, modify and copy data that you are not aware of. The best way to save your computer from these malicious viruses is to install the latest and best anti-virus software, which has become an absolute essential these days.