Guide 1: Why crypto currency exists

So, why does crypto currency exist?

Crypto currency is simply the name given to the next evolution of how we trade items between each other.
It's purpose is to make the way we trade in 2018 (and beyond) easier, cheaper and more efficient than how we can currently can do it. 
In the same way no one regularly calls the internet the 'world wide web' anymore, in time people will refer to cryptocurrency simply as 'money'. However for now, we call it crypto currency to differentiate it... (because it's so new).  

So what is crypto currency, and how will it make my life easier, cheaper and more efficient when buying things?