(CLS). The Framework Class Library was initially referred to
asthe Base Class
Library(BCL), and later just as the Class Library, as the class library. The elements of the Framework Class Library are the classes for the system namespace. They contain most of the elementary features of .NET, including the types for the values, objects, support, and garbage collection. The second and third level namespace supports configuration management, file
andnetwork IO functions, security, web services
, and more. The Java Foundation Classes (JFC) are the equivalent of the Framework Class Library (FCL) in .NET.