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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.

JSON (JavaScript Object Notation) is a lightweight data interchange format widely used for transmitting structured data. It is easy to read and write by both humans and machines. JSON supports key-value pairs, arrays, and nested data structures, making it ideal for APIs, configuration files, and web development. Its simplicity and wide support in modern programming languages make it a de facto standard for data exchange between client and server applications.