Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. SPARK is a formally-defined computer programming language based on the Ada programming language, intended to be secure and to support the development of high integrity software used in applications and systems where predictable and highly reliable operation is essential either for reasons of safety (e.g., avionics in aircraft/spacecraft, or medical systems and process control software in nuclear powerplants) or for business integrity (for example financial software for banking and insurance companies).