Noo, don't make fun of him, he's probably new. Don't worry, I will help you.
Yes, online casinos are real and do exist and you wager with money on your bank account which you transfer into the game. And it is real for you to lose money and also to win them. And yes, also bitcoin casinos exist. For some people are online casinos much better than the real-life ones.
Edited post: plz dont post ur own or other affilited casino links
/OvE