The feature you're referring to, ".NET Framework 2.0 SP1", is a significant update for the .NET Framework, which is a software framework developed by Microsoft that provides a large library of pre-built functionality, a virtual execution environment, and a set of services for building a wide range of applications.
Upd — Netfx20sp1
The feature you're referring to, ".NET Framework 2.0 SP1", is a significant update for the .NET Framework, which is a software framework developed by Microsoft that provides a large library of pre-built functionality, a virtual execution environment, and a set of services for building a wide range of applications.