As many of the new Microsoft Windows applications are developed using .NET Framework, it is becoming mandatory to install .NET Framework on our personal computers. Microsoft provides .NET Framework installer as a free download available to everyone. But it is an online installer. That means, initially we have to download a small piece of installer and upon starting the installation process the installer automatically connects to Microsoft servers and downloads the required components and completes the installation.
This blog post lists all the .Net Frameworks at one place, really nice effort.
All Frameworks