Subdirectories refer to the folders or subfolders that are nested within the main directory of a file system. Synonyms for this term include subfolders, subfiles, nested folders, sublevels, and child directories. These terms denote the underlying structure of the file system, implying a hierarchy of levels, where subdirectories are nested within parent directories. They are commonly used in computer programming, web development, and in file management. The use of these synonyms is essential for clarity in communication when discussing directories, subfolders, and their organization. It's important to choose the most appropriate synonym based on the context of the conversation.