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Part of the World Wide Web's appeal is its wide-open nature. Never before has there been a mass medium with so few barriers between publisher and an audience. Anyone can put a site on the web and reach people all over the world at a little or no cost.
This has its advantages - free speech is exercised on the internet with great success. This also has its disadvantages - content that some people find objectionable is available on the World Wide Web in great quantity.
Web pages can contain interactive programs written with languages such as Java and with technology such as ActiveX. These programs can sometimes expose security holes that put your own computer at risk.
Files you receive over the Web also can contain viruses - small programs that secretly copy themselves to different disks on your computer. Because viruses can intentionally damage files and programs, your Web Browser can be set up to warn you before any file is run from the browser.
When you run a program in a Web Browser, the program runs on your computer just like any other software you use. For this reason, browsers have security settings that restrict the ways a page can interact with your system. By adjusting these settings, you can reduce the risk of harming your computer system.
But with advancement of technology, the virus programs are becoming more complicated to handle, and for this reason some security softwares like antivirus, antispyware and firewalls must be used. These softwares completely protect against any threats and you feel safe while browsing or surfing.