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.

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Financial betting refers to the wagering on the price development of a financial instrument at some later date relative to the current price or level of the instrument, against odds offered by a bookmaker. Maximum potential pay-off of the wager is known when the bet is taken and as a corollary risk is known beforehand by being limited to the initial stake.

Financial betting instruments are a type of digital option. The outcome of the wager at settlement is binary, that is, either a win or a loss. Settlement is executed in cash and there is no delivery of the underlying asset. At any point in time prior to the settlement date bets can often be sold, allowing for possibilities to bet on the accuracy of a market move within the fixed limits of zero win loss of the stake and maximum potential win. A fee might sometimes be charged for this service.

The main difference between financial betting and speculation on financial markets using products such as financial spread betting is that the bet must result in a simple binary win or loss based on an event on the underlying financial instruments. This triggers a fixed payout for a win, while with spread betting the payout or loss varies with the price level of the underlying instrument. Within financial floating odds the odds change for a given strike price as the price of the underlying changes. The floating odds company calculates odds for different strikes and how much can be won upon settlement depends on how much is bet at those odds.

Within financial fixed odds betting, the odds are fixed, while the strike price where a win is achieved relative the current level changes. The fixed odds company will calculate how much has to be bet to win a certain amount upon settlement if the conditions of the prediction become true.