On the Internet, content filtering (also known as information filtering ) is the use of a program to screen and exclude from access or availability Web pages or e-mail that is deemed objectionable. Content filtering is used by corporations as part of Internet firewall computers and also by home computer owners, especially by parents to screen the content their children have access to. Content filtering usually works by specifying character strings that, if matched, indicate undesirable content that is to be screened out. Content is typically screened for pornographic content and sometimes also for violence- or hate-oriented content. Critics of content filtering programs point out that it is not difficult to unintentionally exclude desirable content. Content filtering and the products that offer this service can be divided into:

• Web filtering , the screening of Web sites or pages
• e-mail filtering , the screening of e-mail

for most small-to-medium size businesses (SMBs), security is a huge challenge. With systems connected to the Internet, any company could fall victim to malicious threats like viruses, worms, hacker attack, spam and in-appropriate content. SMBs face this reality everyday, often with limited IT staff juggling various projects and with limited expertise to maintain and implement them. For SMBs that want to stay in control of their defenses – monitoring protection, ensuring system compliance, and troubleshooting problems – this is an expecially difficult reality! Administrators want to keep the destiny of their own security in their own hands without the complexity. Virus protection without a means to centrally manage it is like a human body without a brain.