Web-based online casinos (also known as no-download casinos) are websites where users may play casino games without downloading software to their local computer. However, with advanced technological changes, an online casino can now accommodate both. Traditionally, online casinos would include only one of the two platforms. Online casinos are broadly divided into two categories based on the software they use: web-based and download-only casinos. The payout percentage for these games are established by the rules of the game. Assuming that the online casino is using an appropriately programmed random number generator, table games like blackjack have an established house edge. Some online casinos claim higher payback percentages for slot machine games, and some publish payout percentage audits on their websites. It is a prolific form of online gambling. Online casinos enable gamblers to play and wager on casino games through the Internet. Online casinos, also known as virtual casinos or Internet casinos, are online versions of traditional (' brick and mortar') casinos.

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