How to check whether there is value in a variable range?

[marlonsaveri]

When we do a search using .find:

 Set sought = Sheets(i).Cells.Find(what:="Hello World", After:=Range("B3"), LookIn:=xlFormulas, _
        LookAt:=xlPart, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
        MatchCase:=False, SearchFormat:=False)

and we need to know if something was found, what's the difference between "If Not sought Is Nothing Then" and "If sought Then"?

Thanks