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.

Play is a range of voluntary, intrinsically motivated activities normally associated with pleasure and enjoyment. Play is commonly associated with children, but positive psychology has stressed that play is imperative for all higher-functioning animals, even adult humans.

The rites of play are evident throughout nature and are perceived in people and animals, although generally only in those species possessing highly complex nervous systems such as mammals and birds. Play is most frequently associated with the cognitive development and socialization of those engaged in developmental processes and the young. Play often entertains props, tools, animals, or toys in the context of learning and recreation. That is, some hypothesize that play is preparation of skills that will be used later. Others appeal to modern findings in neuroscience to argue that play is actually about training a general flexibility of mind – including highly adaptive practices like training multiple ways to do the same thing, or playing with an idea that is good enough in the hopes of maybe making it better.

Some play has clearly defined goals and when structured with rules is called a game, whereas, other play exhibits no such goals nor rules and is considered to be unstructured in the literature. Play promotes broaden and build behaviors as well as mental states of happiness – including flow.

Play has traditionally been given little attention by behavioral ecologists. Edward O. Wilson wrote in Sociobiology that No behavior has proved more ill defined, elusive, controversial and even unfashionable than play. Though it received little attention in the early decades of ethnology, and instead only existed as a matter of study within human psychology, there is now a considerable body of scientific literature resulting from research on the subject. Play does not have the central theoretical framework that exists in other areas of biology.

Ethnologists frequently divide play into three general categories: Social play, locomotors play and object play. Locomotors play is the pretend playing that a very young animal participates in when alone. The jumping and spinning characteristic of locomotors play can best be seen in young goats. Researchers have theorized that locomotors play helps the cells in the cerebellum of the brain to develop connections. Types of play listed by psychiatrist Dr. Stuart Brown expand upon these basic categories to include fantasy and transformational play as well as body, object, social. The National Institute for Play describes the previous five play types, as well as the play types attunement and narrative.

The broaden and build behaviors it fosters may have even greater value for adults than children. The mental state of flow is also a major component of play, and has itself been associated with things like creativity and happiness. Brown often quotes Brian Sutton-Smith's insight: the opposite of play is not work, it is depression. 6] Examples of adult play abound e.g. the arts, but also curiosity driven science.

Tim Brown explains that a value like a bit of shamelessness during the creative process is extremely important in adult designers.

Play may allow people to practice useful habits like learned optimism, which might help manage existential fears. Play also offers the opportunity to learn things that may not have otherwise been explicitly or formally taught e.g. how to use, and deal with, deceit and misinformation. Thus, even though play is only one of many habits of an effective adult, it remains a necessary one.