Question

What is primary group and secondary group in linux?

Answer 1

THE PRIMARY GROUP:This is the group applied to you when you log in in most user cases it has the same name as you login name.The primary group is used by default when creating new files ,modifying files or executing commands.
THE SECONDARY GROUP :This are the group when you are member of beyond primary group.

Answer 2

Explanation:

SECONDARY GROUP

IN LINUX :-

These are the group when you are the member of beyond primary group.