Gambling is something you put money or bet in to a game, it might be small or big.
I enter to real casino once it is so addicting even I loss sometimes in my bets still I find it so entertaining which makes me feel happy despite the fact that i loss my money. Maybe the thing that we need to set up in to our mind is put bet what you can afford to lose.
But there are people who treat gambling as their business because they know how to play the game, the tricks and techniques, but most it is for their entertainment.