Online casinos, also known as virtual casinos or Internet casinos are online versions of traditional brick and mortar casinos. Online casinos enable gamblers to play and wager on casino games through the Internet.

Online casinos generally offer odds and payback percentages that are comparable to land-based casinos. Some online casinos claim higher payback percentages for slot machine games, and some publish payout percentage audits on their websites. Assuming that the online casino is using an appropriately programmed random number generator, table games like blackjack have an established house edge. The payout percentage for these games is established by the rules of the game.

Online casinos can be divided into two groups based on their interface: web-based and download-only casinos. Some casinos offer both interfaces.

Some casinos offer 'Live gaming', either exclusively, or as part of a wider online casino offering. In live online casinos, popular casino games such as roulette and blackjack are dealt by real dealers in casino studios, in an attempt to convey more of the atmosphere of a physical casino. Player actions including chat such as 'hit' in the game of blackjack may be transmitted to the dealer; in some online casinos more than one player may 'sit' at a particular 'seat' on the table, and in this case there is no interactivity between player and dealer. The question of which player s requested the extra card that the dealer dealt and which chose to 'stand' will be handled by the software. It is usual for players to be able to observe a video feed of the action, and equally common for players to opt to turn it off, if they lack the bandwidth - as the cards are read by OCR and other technology, the video feed is only ever a visual cue.

Web-based online casinos

Web-based online casinos are websites where users may play casino games without downloading software to the local computer. Games are mainly represented in the browser plug-ins Macromedia Flash, Macromedia Shockwave, or Java and require browser support for these plug-in. In addition, bandwidth is needed since all graphics, sounds and animations are loaded through the web via the plug-in. Some online casinos also allow game play through a plain HTML interface. Apple devices such as IPod, IPad and IPhone cannot play Flash games as the technology is not supported.

Download-based online casinos

Download-based online casinos require the download of the software client in order to play and wager on the casino games offered. The online casino software connects to the casino service provider and handles contact without browser support. Download-based online casinos generally run faster than web-based online casinos since the graphics and sound programs are located within the software client, rather than having to be loaded from the Internet. On the other hand, the initial download and installation of a download-based online casino client does take time. As with any download from the Internet, the risk of the program containing malware does exist. Still the graphics and sounds at download-based online casinos are most of the time much better than those at web-based online casinos.

Comps

In the context of casinos, comps are complimentary items given out by casinos to encourage players to gamble. The amount of comps that a player is given usually depends on what game they are playing, how much they are betting, and how long they have played. Most casinos have hosts who are responsible for giving out free items and contacting players to bring them back to the casino. Pit bosses can also award comps at table games. Most casinos now require a player to have a player's club or similar card, so that their play can be tracked and comps awarded.

The lowest level of comp available at most casinos is free alcohol and other beverages. Many casinos provide free drinks to anyone who is gambling.

The second level of comp that many players earn is free meals. Many casinos have several restaurants and may require more play to earn a comp to the higher end restaurant. Often the player is given a certain amount to spend, but sometimes, particularly with high rollers, the player may be given the right to order as much food as they want.

The next level of comps is usually free hotel rooms. Many casinos have attached hotels, but those that don't may have the ability to comp rooms to a hotel nearby. Many casino hotels have higher quality rooms, such as suites, villas, presidential suites and so on for bigger bettors. Many players who receive hotel rooms receive a package called RFB for room, food, and beverage or RF for smaller bettors, or jurisdictions where casinos are not allowed to give free alcohol.

Many casinos also offer other comps, especially to high rollers. These may include airfare reimbursement, limo rides, prostitution services, tickets to shows, golf, free concierge services, cash back, private gaming areas, and private jet service.

Casinos also frequently offer players comps by mail. These may be free bet offers, free meals, discounted or free rooms, or entries into tournaments or prize drawings.

Thoroughbred Horse Racing

The Thoroughbred is a horse breed best known for its use in horse racing. Although the word thoroughbred is sometimes used to refer to any breed of purebred horse, it technically refers only to the Thoroughbred breed. Thoroughbreds are considered "hot-blooded" horses, known for their agility, speed and spirit.

The Thoroughbred as it is known today was developed in 17th and 18th-century England, when native mares were crossbred with imported Oriental stallions of Arabian, Barb, and Turkoman breeding. All modern Thoroughbreds can trace their pedigrees to three stallions originally imported into England in the 17th century and 18th century, and to a larger number of foundation mares of mostly English breeding. During the 18th and 19th centuries, the Thoroughbred breed spread throughout the world; they were imported into North America starting in 1730 and into Australia, Europe, Japan and South America during the 19th century. Millions of Thoroughbreds exist today, and more than 118,000 foals are registered each year worldwide.

Thoroughbreds are used mainly for racing, but are also bred for other riding disciplines such as show jumping, combined training, dressage, polo, and fox hunting. They are also commonly crossbred to create new breeds or to improve existing ones, and have been influential in the creation of the Quarter Horse, Standard bred, Anglo-Arabian, and various warm blood breeds.

Thoroughbred racehorses perform with maximum exertion, which has resulted in high accident rates and health problems such as bleeding from the lungs, low fertility, abnormally small hearts and a small hoof to body mass ratio. There are several theories for the reasons behind the prevalence of accidents and health problems in the Thoroughbred breed, and research continues.