For those that care, Framework is the old original .NET for Windows; Core is the new multiplatform .NET; Standard was an, ahem, standard, for writing code that

For those that care, Framework is the old original .NET for Windows; Core is the new multiplatform .NET; Standard was an, ahem, standard, for writing code that would work under both Framework and Core. Since the release of .NET 5 "unifies" Framework & Core (for some value of n), there is no longer a need for Framework, Core, nor a unifying Standard.