What Minification is not?
Reduce the file size
Does nothing to reduce file size which is really our main goal here? Now we are also not talking about compression which similar to encryption is a process that translates the data. So to speak with a singular goal of reducing the number of bits required to represent it. We all know compression from programs like WinZip, 7-zip, WinRAR and so on which can take any file be it text, code, audio or video and scrunch it down to use a highly technical term into a smaller file size to reduce its impact on storage and bandwidth.
What is Uglification?
Reduce Scripts and Functions in your Website
If you have a large website with lots of scripts and functions and lots of traffic, what seems like a pretty trivial issue here could stack up to lots of savings in terms of bandwidth. Not to mention all those saved milliseconds in page load times which could add up to real significant time and increased user experience.
These things are a game of inches and every little thing you can do to optimize your site may be just what it takes to improve your SEO and bump you up a notch in the SERPs.