EPPlus
EPPlus is a .NET library for reading, writing, and manipulating Excel files (XLSX format) without requiring Microsoft Excel to be installed. It provides a high-level API for creating spreadsheets, adding data, formatting cells, and performing calculations, making it ideal for server-side Excel generation in applications. The library is open-source and widely used in .NET environments for automating Excel-related tasks.
Developers should learn EPPlus when building .NET applications that need to generate, modify, or export data to Excel files, such as for reporting, data analysis, or bulk data entry tools. It is particularly useful in scenarios like web applications that allow users to download reports in Excel format, backend services that process spreadsheet data, or automation scripts for business workflows, as it eliminates dependencies on Excel installations and offers good performance.