Excel XLSX
Excel XLSX is the default file format for Microsoft Excel spreadsheets, introduced in Excel 2007 as part of the Office Open XML (OOXML) standard. It stores data, formulas, charts, and formatting in a compressed, XML-based structure, replacing the older binary XLS format. This format is widely used for data analysis, reporting, and business applications due to its compatibility and rich feature set.
Developers should learn Excel XLSX when working with data export/import, automation, or integration tasks in business or scientific applications, as it's a common format for sharing structured data. Use cases include generating reports from databases, parsing user-uploaded files in web apps, or automating spreadsheet creation with tools like Python's openpyxl or pandas. It's essential for roles involving data processing, financial modeling, or enterprise software that interacts with Excel files.