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In this tutorial, the speaker discusses how to merge multiple PDF documents into one using Java. They mention the PDFMergerUtility class used for this purpose. The process involves creating an object of PDFMergerUtility to represent the output file and then adding pre-existing PDF files to it. A function called mergePDFs is created, which takes a string variable argument for file paths. The function handles exceptions and sets the destination file for the merged documents.
