A folder in the parent folder is called a sub-folder , a child folder , or simply a child. A name of up to 255 characters is assigned to every folder and file. The folders are always organized by their name in a combined alphabetical and numerical order, called an alphanumeric order. Files in a folder can be arranged in various ways including by their name, date last modified, and file size. They can also be sorted in ascending or descending order.
Major projects can have their own folder and sub-folders.
Just like a paper file folder, a folder on a hard drive can contain many documents or files. This is often where problems first occur in both filing systems. For example, with many documents in the word processing folder, it can become unmanageable. The documents are probably for various projects. Some of those projects have long since been completed.