Whatever type of business you are attempting to conduct on the internet, one of the most important elements of that business is the software you choose to run the site. This is particularly true if financial transactions are carried out on the site. The safety and security of your customer’s personal information is paramount and it is the computer software which is responsible for that element of the business. When it comes to the online casino business, the casino software chosen by the online casino operator takes on an even more important role because the software is also responsible for the design and presentation of the casino games on the site. Online casino gamblers will invariably choose which online casino to register with based on the quality and range of the casino games available on that site, and that even applies to the standard casino games such as roulette and blackjack where the graphics and site layout can have a significant effect on our enjoyment of playing these casino games online. Most important of all for many online casino gamblers is the range of slots and video slots on a particular online casino site, and again it is the chosen casino software which is responsible for providing this choice of casino games. The importance of the online casino software has meant that most online casino operators choose to use specialist casino software companies, the largest of which are Wagerworks, Microgaming, Playtech and Chartwell, who between them supply casino software to many of the online casinos listed on this site. Another pointer to the importance of the casino software to the online casino operators is the increasing trend for the major online casinos to take over or merge with their software supplier, as has been the case with William Hill who now own Playtech, and Paddy Power who own Cayetano which is one of the smaller but no less successful casino software companies.