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Apex Collections (APEX_COLLECTION) is a package that comes with Oracle Apex and is one of the most important features that comes with Oracle APEX. It can be used in many ways for different purposes, but in general, you can think of Apex Collection as a temporary space to store complex data Types - non-scalar - for instance, full row of data from a table or a view (When you work with Apex Temporary table is not a real option).