How good is Linux, how is it different from windows and can you use Skype with Linux ?

Hi All,
I am looking at buying an Acer Aspire notebook that comes with Linux. However I have no ideas what linux really is, how to use it and how does it compare to Windows? How easy is it to use? Are you still able to watch DVDs and play cd's on it? Also are you able to use Skype on it? I know this all sounds really blonde but i am, so i can get away with it! Thanks!
Any help would be greatly appreciated

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).