rmdir
The rmdir is used to delete a directory. It does the opposite of the mkdir command.
Deleting a folder
To delete a folder, use:
rmdir folder_name
If the folder is empty then it would be deleted, otherwise you'd get an error similar to rmdir: folder_name: Directory not empty.
To circumvent this, pass an -r flag which stands for recursive, and use rm instead of rmdir. This would delete the directory and it's content.
rm -r folder_name
Deleting multiple folders
To delete multiple folders, use the commands as shown below.
rmdir -r first_folder second_folder third_folder
Remember, the -r flag is optional and you are expected to use it only when you want to forcefully delete folder items.