useradd vs adduser

Whenever I need to add a user to an Ubuntu based box, I can NEVER remember if I want to use adduser or useradd.  I always remember that one of those commands will create the home environment, set a password, and more.  The other one, just adds the user to /etc/passwd.  I often want the command to set up the environment, so what is the difference?

useradd is a binary.

adduser is a perl script that is Ubuntu based.  This is the script that will actually do all of the work to really create a good, ready to use user.

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