What is the difference between the Group and join?

I understand what is the grouping of contacts. and I saw the impact of joinging contacts but why would I do that? He takes the contacts that join off the my list of good contacts individuals list is deleted and all that remains is the name of the principal that joined you.

Why do this?

If you have the same contact in more than one group of Gmail, the droid will join them together. This prevents duplicates appear in the contacts list.

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