Many makers of software have been providing this service for many years for companies who do not want to have one designed and built specifically for their own use. Some bright ideas from software engineers who made anti-virus software , got the idea that as they already protected the files that were in the computer from viruses, why not protect it from others who might want not to corrupt or render the files useless but to take them and the information and use it for personal gains. Then came the firewall which was developed to block unauthorized traffic into the computer through the internet protecting the user’s files.