According to a recent report, the market size of the casino and online gambling industry worldwide reached a total of $231 billion in 2021. The commercial casino industry has seen significant growth over the last few decades as licensed casinos have expanded to new markets and generated record-breaking revenue figures. Gambling is one of the biggest industries in the world. Teenagers engage in both regulated and non-regulated forms of gambling. Globally, gambling is perceived as a harmless or low-risk social activity for participants of all ages. A few examples include instant lotteries, Bingo, betting on billiards or pool, card games, and casino games. Gambling is generally referred to as a combination of consideration, risk, and a prize. Gambling, also known as betting, involves wagering something of value, with an uncertain outcome on the line. If you want to read about some more gambling countries, go directly to 5 Biggest Gambling Countries In The World. In this article, we discuss the 15 biggest gambling countries in the world.