What is a Ransomware? | #WannaCry | History behind it | How to protect urself?

What is this WannaCry Ransomware? 

It has caused damage worth Billion Dollars... It has spread over 74+ countries, infected millions of computers worldwide... 

So today in this very short video I've given a short description to what is a Ransomware? What is this WannaCry Ransomware? It's history, and tips to protect urself...

I hope u will enjoy watching this video....