There's a large selection of free and open source (FOSS) operating systems available these days, and choosing the right one for any given circumstance can be quite a challenge. This article outlines the key factors.

We are very familiar with Linux and its relation with UNIX.But most us of dont actually know what are differnces between the two.
Linux is called Unix-like and is not a true Unix operating system.

The new version of Ubuntu, codenamed Lucid Lynx, is scheduled to arrive in April. It will be a long-term support (LTS) release, which means that updates will be available for three years on the desktop and five years on servers.

Domain Name Service (DNS) was created in 1983 out of the necessity to convert IP Addresses like 192.168.9.2 to domain names like example.com. DNS is a distributed database, what this means is that no one computer is used to maintain a complete database of all of the domains on the Internet. Instead this information is distributed across many computers.

Here You can see a simple trick for beginners . This will improve your efficiency .

Well almost everyone knows what skype does. Let's see how we can easily install skype on ubuntu 10.04 Lucid Lynx

And the simple answer is: no, you do not need an anti-virus in Linux. Yes, let me tell you a little secret. Come closer. That's it. You don't need an anti-virus in Windows, either! Boom! There you go.