They are also referred to as virtual or internet casinos. Online casinos are a modern version of land-based casinos, which allows gamblers to play casino games using the internet. An advantage of online casinos over land-based casinos is that online casinos can be easily accessed. They also offer odds and payback ratios that are higher than those of land-based casinos are. There are two types of online casinos namely, web based and download only casinos.

It is also called flash casinos. It is comprised of websites where gamblers play casino games without having to download software on their devices. They require browser support and bandwidth as games are mainly in the browser plug-ins and the games graphics have to be loaded through the web.

These require an initial download of the software to play. The software once downloaded does not require browser support. They are faster to use than web-based casinos as graphics, and sound programs are cached by the software client thus does not require to be downloaded.