EPPlus is a powerful and easy-to-use .NET library for reading, creating, and modifying Excel .xlsx files (Office Open XML format).
It provides an API similar to working with Excel itself — with support for formulas, charts, tables, styles, data validation, pivot tables, and more — all without needing Excel installed.

It’s ideal for:

• Generating Excel reports dynamically
• Importing or exporting data from databases
• Creating dashboards or analytics reports
• Building REST APIs that return Excel files