The name “.NET Framework” is a misnomer. A framework (in programming terms) is a collection of Application Programming Interfaces (APIs) and shared code libraries that developers can call when developing applications. In the .NET Framework, shared code libraries are known as Framework Class Library (FCLs). Bits of code in a shared library can perform all sorts of different functions. Developers need their application to be able to ping other IP addresses on the network. Instead of writing that code themselves and writing all the bits and pieces that have to interpret the ping results, they can use code from a library that serves that function.
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