Framework Class Library
The Framework Class Library (FCL) is a component of Microsoft's .NET Framework, the first implementation of the Common Language Infrastructure (CLI). In much the same way as Common Language Runtime (CLR) implements the CLI Virtual Execution System (VES), the FCL implements the CLI foundational Standard Libraries. As a CLI foundational class libraries implementation, it is a collection of reusable classes, interfaces and value types, and includes an implementation of the CLI Base Class Library (BCL).
- ".NET Core vs .NET Framework: How to Pick a .NET Runtime for an Application". Stackify. Retrieved June 24, 2019.