metadata is a PyPDF2 attribute that allows developers to extract or modify the metadata of a PDF file. It's useful for automating the process of extracting information from PDF documents, such as the author, title, or creation date. With metadata, developers can also modify the metadata of a PDF document to update information or add new metadata to the file.

Congratulations on finishing your project about handling PDFs in Python! It's no small feat to work with such complex and often challenging file formats, so kudos to you for persevering and completing your work. Keep up the great work, and I can't wait to see what you'll accomplish next!