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XLSX is a spreadsheet file format used by Microsoft Excel and other spreadsheet software. It is based on the Open XML standard and supports advanced data analysis features including formulas, charts, tables, and pivot tables. XLSX files are widely used in finance, business, and academic fields for organizing and analyzing data. Compared to the older XLS format, XLSX offers better performance, reduced file size, and improved data recovery. It is supported by many third-party applications.

PDF (Portable Document Format) is a widely-used file format developed by Adobe that captures documents as they are meant to be viewed. It preserves text, images, layouts, and fonts across all platforms and devices. PDF is ideal for sharing official documents, forms, reports, and eBooks. It supports interactivity, including hyperlinks and fillable fields. PDFs can be secured with passwords and digital signatures, making them suitable for confidential or professional use.