What's the implicit joins and how to configure it?

Hello guys
what's the implicit joins and how to configure it? What's the purpose of implicit and explicit joins?
Please help
Thank you

Thus, on my side, I think that :
Explicit join define the join condition between the key column from the table.
(table1.di = table2.id)
While
Implicit Join define :
* the type of join outer, inner, ...
http://gerardnico.com/wiki/dw/join/start
* And the relationship (one-to-many, cardinality)
http://gerardnico.com/wiki/dw/data_quality/relationships
And all this information are used to generate the statement (query).
And I don't really know why you have two type of key :
* Physical Foreign Keys
* Logical Foreign Keys
Regards
Nico

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