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What is dynamic join?

Can you please explain what a dynamic join is? Dynamic selection is only possible in OPENQRYF and embedded SQL. When we use the logical files, use the selection, and omit the keyword to select and omit a record, is this not a dynamic selection? If not, why?
Dynamic means that the join criteria is not applied until the query is actually run.

A keyed logical file with Select/Omit is not a dynamic selection because the selection (& omission) of records is done at the time that the logical file is created. The keyed select/omit logical file only contains entries for those rows meeting the select/omit criteria, so no additional selection is applied during the execution of the query or the open of the LF operation.

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