What is the best diff/file comparison tool for Windows?

What is the best diff/file comparison tool for Windows? On OSX I was using VisualDiffer. (diff functionality isn’t built in to Visual Studio, is it?)

WinDiff is the only standalone tool I’ve used on Windows outside of the compare tool built into Visual Studio for source control. It works pretty well. It’s rather old though and I’m not sure if it works on current OS’s. You could try WinMerge:

Thanks.