XLSX
PDF files
XLSX (Office Open XML spreadsheet) is the modern file format for Excel spreadsheets. XLSX files store tabular data, formulas, and formatting. They offer improved data integration, enhanced security, and support for larger datasets compared to XLS.
PDF (Portable Document Format), a format created by Adobe, ensures universal viewing with text,images, and formatting. Its portability, security features, and print fidelity make it pivotal in document tasks, apart from its creator's identity.