QuickBASIC is a programming language that is part of the Microsoft QuickBASIC integrated development environment (IDE). It is an evolution of earlier BASIC languages, intended for beginners but powerful enough for professional programmers. QuickBASIC, enhanced with structured programming constructs and support for modular code design, made it easier to write more complex programs than its predecessors by providing libraries and debugging tools. The IDE included an editor with syntax highlighting and autocomplete features, as well as a compiler that converted source files into standalone executable binaries. Although it has not been widely used since it was replaced by Visual Basic in the 1990s, QuickBASIC remains notable in computing history as a tool that helped many people learn to program on early PCs running DOS operating systems.