The Contao CMS is a full-featured CMS that requires the administrator of the software to login to the back end interface using  a login and password.  The back end modules allow the administrator to make content changes, layout changes, provide account management and access to systems settings and developer tools.  It is therefore important to keep the password and user name secure in order to keep the software from being maliciously attacked.  Follow good security practices by regularly changing the password to keep user data or other intellectual property out of the wrong hands.  The following article quickly guides you in logging into the Back End modules for Contao.