if you trying to delete a directory and all files under it, rmdir will fail with error message:
rmdir: failed to remove '<directory>': Directory not empty
The option is t remove using rm command with -rf option. r is for recursive and f is to force and ignore warnings and errors. There is no undo option, so be very careful.
rm -rf dirToDelete
using the rm -ir generates a message for each file or directory and deletion happens based on y or n that we can type in.