Software construction is the discipline within software engineering focused on the detailed creation of working software through coding, debugging, and unit testing, translating design specifications and requirements into executable code. It investigates methods, techniques, and tools to ensure the technical quality, reliability, and maintainability of the implemented software, emphasizing practices like coding standards, algorithm selection, data structure usage, and rigorous unit-level verification, thereby forming the fundamental core where software is physically built and its foundational quality established.