What exactly is a blog and how do i make my own?

I'm a little confused in the sense that i don't really know exactly what a blog is supposed to be. Is it a page where someone can update mini essays on whats happening in their life, or about a subject of their choice? Or is a blog actually a whole new page in itself, which has its own subject and information on it? Also, are there any sites which will allow me to create my own blog(s) for free?

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…).