The origin of online casinos dates back to 1990s when the first casino was launched live on the Internet. Now it has become very popular with all age-groups and backgrounds coming online to take part in casino games. It basically involves earning money by way of gambling. The gambling games or activities initially were played in Brick and mortar casinos, an outlet which hosts these games along with live entertainment. However, the internet has enabled game developers to devise online casino that can be enjoyed from home. The online games are user-friendly, accessible and practical.It is regarded that the online gambling sector is a $6 billion industry which is regulated in 40 countries worldwide. For instance, there are more than 1500 gambling centers in the United States with many located in Las Vegas and Atlantic City. Now the world wide web has launched several leading US casino sites like Slots Oasis, Cirrus, Rushmore, Royal Ace, Diceland, and more.Types:There are commonly two types of web-based casino’s in which visitors can directly log into the site and play a game without the need to download any software. The games can be played in browsers like Java, Macromedia flash and shockwave. Besides, it requires high bandwidth to run the graphics, animation and sound’s of the game. On the other hand, download-based internet casino’s requires players to download particular software to access the games. This is a better way as it provides all necessities to play the game without any browser support. These web-based casinos function similar to a traditional casino by incorporating the same type of rules and rewards. Furthermore, there are several security measures being levied on these casinos to ensure that they are safe and not fraudulent.Additionally, many leading web casinos provide signup bonuses to players who make initial deposits. The bonus range is between 10-50% depending on the amount of the first deposit made. Furthermore, the player will need to wager the bonus amount around two to ten times before cashing out the earnings. The money earned can be transferred to one’s own bank account or through online payment accounts.Popular casino games:The online casino portals offer a wide range of casino games. There also offer casino guides and reviews available that gives users details on online casino basics and techniques to play a more profitable game. Some of the popular games include:Blackjack – This is a widely favored table game which is played with cards and is statistical in nature. The rule of the game is to obtain a total count of 21. All compete against the dealer and the player closest to 21 without going over is declared the winner.Roulette – This is a board game which comprises of numbers in varying colors with a ball placed on the roulette wheel. When the roulette wheel is spun, the ball spins and the number at which it stops decides the winning bet.Video poker – This is a game which requires good skills. It allows the player to draw up to five cards which can be replaced with new cards during the game. The outcome is ascertained on the basis of the final hand left after striking the draw button.With an array of gambling sites available, it would be ideal to thoroughly evaluate the credibility of the usa online casino site, software, payment modes, bonuses etc. before choosing the worthy and reliable online casinos.