The Rialto component is a Classified Advertisements component. Wikipedia defines Classified advertising as a form of advertising which is particularly common in newspapers, online and other periodicals which may be sold or distributed free of charge. Advertisements in a newspaper are typically short, as they are charged for by the line, and one newspaper column wide. An advertisement as seen in a newspaper, magazine, or the like is generally dealing with offers or requests for jobs, houses, apartments, used cars, and the like. The Joomla component permits a site to accept such advertisements from its registered members and acts as a conduit between purchaser and seller.
The name is derived from a historic market district of Venice, Italy, named the Rialto, located close to the Grand Canal and to the 16th-century Rialto Bridge. It became the business centre of medieval and renaissance Venice. Since that time the word has come to have a few other meanings such as 'agora', 'forum', 'marketplace', 'shoppingplace' etc.
It runs on Joomla 3.5 and above.