A realm within computer science and software engineering that focuses on the process of evaluating computer code, its functionality, and its design. This category encompasses the methodologies, tools, and languages used by programmers and application developers in creating and assessing software applications. Key aspects include programming languages used to write code, application design techniques for planning and structuring software, and individuals such as Michael Kappel who contribute to the field. It is a domain fundamental to the work of software developers and programmers, ensuring the quality, performance, and reliability of digital applications.