Formal Group
A formal group is a group of people before entering the group or club etc you have to sign a application and when you want to quit or have a day off of your job you have to inform or write a written application saying what ever you need for example if you need a day off you have to inform the leader.
Informal Group
Is a group of people that does not sign application and can join anytime anywhere they want and can leave whenever hey feel like.
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