Re: Somebody can explain what is block-chain is and why we do mining?
I cannot understand how my processor earns bitcoin, and who gives me it!?
Maybe 
you are mining Bitcoin 
By mining Bitcoin you will get a reward in every block that you mined.
For more information kindly visit that AdolfinWolf provided ↓
It's explained more in-depth in the article with other examples & technicalities. -> https://www.investopedia.com/tech/how-does-bitcoin-mining-work/