EPPlus
EPPlus is a .NET library for reading, writing, and manipulating Excel files (XLSX format) programmatically without requiring Microsoft Excel to be installed. It provides a high-level API for creating spreadsheets, formatting cells, adding charts, 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 in reporting systems, data export features, or financial applications. It is particularly useful in scenarios where server-side Excel processing is required without user interaction, like in web APIs or batch jobs, due to its performance and ease of integration with .NET frameworks.