It's a code verifying to the online game system "steam" that do you did in fact purchase the game you're trying to register.
If you're asking for us to give you one, we don't do that.
Chat with our AI personalities
You receive a verification code for Minecraft after you buy it.
Bhw
it should say the code in the email
jsdfuiw4eyasdkjkl
To create a Steam account you need to go the the Steam Powered website and go to Create A New Account. There will be a form to fill out and you'll get an email with a verification link that you need to click.