The .NET Framework provides the Base Class Libraries (BCL), which can be used by all languages. These libraries range from those that are a portal to core functionality of the runtime, such as threading and runtime manipulation of types (reflection), to libraries that provide high-level functionality, such as data access, rich client support, and web services (whereby code can even be embedded in a web page). C# has almost no built-in libraries; it uses the BCL instead.
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