Perhaps MySQL's main claim to fame is the relative ease with which you can manage a database-driven Web site. Not only can MySQL quickly provide the information your customers want, MySQL can also track Web activity. Your customers probably won't tell you when they can't find what they're looking for, but MySQL can, which means you'll learn about problems before they turn into lost business. Current favorites include Apache for Unix and IIS on Windows platforms. Another benefit is the cost.
Client programs are free on all platforms.
The Windows version of the MySQL server does require a small licensing fee, which helps defray the development costs and provide continuing development and support. There's more information about licensing and support at the MySQL Web site .