CCleaner allows users to delete obsolete temporary files from Internet browsers and other support applications by browsing history, cookies, trash, and AutoComplete form history.  It allows trash removal, memory dump, file fragmentation, log files, system buffers, application data, and other forms of data. It also allows you to delete the registry to locate and fix problems in the Windows Registry such as the loss of shared DLLs, unused file extensions and application paths.
This is software developed by Piriform and run with Windows operating system. CCleaner has 47 different languages, including Vietnamese, by Nguyen Thanh Phong. Piriform claims that CCleaner has been downloaded more than 700 million times from the company's homepage as of July 2011.