A primary account has full administrative access to a Comcast account, and controls how much the secondary accounts can see and do.
Differences between primary and secondary accounts
The primary user/account is the account administrator. They have full access to the account’s features and settings and can create, delete or suspend secondary accounts.
Secondary accounts can be designated unrestricted or restricted. An unrestricted secondary account has full access to all the account features. A restricted secondary account does not.