How do you create a text file which list the contents of a folder and its subfolders?

To create a text file that lists the contents of a folder and its subfolders, you can use the command line. On Windows, open Command Prompt and use the command dir "C:\path\to\folder" /s > output.txt, replacing the path with your target folder. On macOS or Linux, use the Terminal and run ls -R /path/to/folder > output.txt. This will generate a file named output.txt containing the directory structure and contents.