Is A Week Of No Pills Advisable Post Intake Of Contraceptive Pills For Three Weeks?

If the cycle of using BIRTH CONTROL PILL is (take it in 21 days or 1pack & followed 7 days / 1 week free off pills); Is that cycle will be repeat again like in the first day? After 21 taking pills , still do i have to have 7days free off pills and then repeat again?