ASP Text Files: What's the implication of "Nothing" in the example below?

[no.]

<%
dim fs,tfile
set fs=Server.CreateObject("Scripting.FileSystemObject ")
set tfile=fs.CreateTextFile("c:\somefile.txt")
tfile.WriteLine("Hello World!")
tfile.close
set tfile=nothing
set fs=nothing
%>
Come ONNNNNN
I need answers, people. Just write me one already!