What term describes documentation that is embedded within code as comments?

• A. External documentation
• B. Secondary documentation
• C. Primary documentation
• D. Internal documentation

Answer: (D)

Internal documentation is documentation embedded directly in the source code as comments. This kind of documentation stays with the code and is read by developers who are reading or maintaining the program, explaining what the code does, why certain decisions were made, and how to use functions or classes. It differs from external documentation, which lives outside the codebase in separate files or sites for users or API consumers. In-code comments are a hallmark of internal documentation, whereas terms like primary or secondary aren’t the standard way to categorize these embedded notes.