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Originally written and released by Richard Schwartz, Robert Shostak and their company, Ansa Software, in 1985, Paradox was a relational database management system. Borland bought the company and the software in 1987, and later retooled and updated Paradox. Paradox for DOS was successful in the late 1980s and early 1990s, despite dBase and xBase clones dominating the market. Paradox included many distinguishing features, including a visual Query by Example implementation that was supported by an AI engine, effective use of memory, an innovative programming language, Lotus-like text menus and windows, and well illustrated, well laid out, and well explained manuals.