Minification is the process of removing all unnecessary characters from source code without changing its functionality. It removes white space, new line and comments. The process of minification generates a much smaller CSS.
Minification is a bandwidth optimization technique that reduces the amount of data that needs to be transferred. It optimizes your site speed, it is a SEO factor.
Why beautify css ?
When a source code is minified, it is difficult to read and understand. Beautify your CSS for easier reading.