You want some information about a firewall.
You want to know wahat a firewall is.
In simple words a Firewall is a piece of hard- or software that is used to separate two networks. It allows or prohibits traffic between the networks on the basis of predefined rules.
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.