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Under Linux, permissions are assigned to users and groups. Each user can be a member of different groups, and membership in these groups gives the user specific, additional permissions. Each file and directory belongs to a specific user and a specific group. So the permissions for users and groups that defined a file are also defined for the respective owners. When we create new files or directories, they belong to the group we belong to and us.

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kali@kali[~]$ ls -l /etc/passwd

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