Online casinos are a fairly broad concept. Such establishments can provide access to a wide variety of types of gambling entertainment: from the simplest slot machines to roulette, poker or lotteries. The ways of playing are also significantly different. Most often, online casinos real money casino apps offer to play games on their website, but recently more and more players use special clients for computers and laptops, as well as applications for mobile devices (phones, tablets, and so on). Online casinos are seriously different from land-based gambling establishments. The main feature of online versions of slot machines is the use of a random number generator to calculate the results of the game. Slot machines in the halls of ordinary casinos have a similar principle of operation, but additional staff is involved in servicing the tables, and to start the machines, you need to buy special tokens. Another important feature of the online casino is the ability to play slot machines for free and without registration. Classic casinos do not have this option for obvious reasons. Their goal is to earn money, so it is not profitable for them to use the area of halls for free games.There are no problems with this on the internet – players can always play at the casino online for free. The free game not only does not harm the business, but even significantly increases the interest of customers in the institution.