What are the protests in Egypt about and how did they start?

I hate to sound ignorant, I really don't intend to...but I'm not 100% on what the current protests in Egypt and Tunisia are about, or indeed how they started and what they are being sustained for. Explanations?

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…).