What does Minify CSS mean?

Simple - to compress the CSS so it loads faster

Minification is the practice of removing unnecessary characters from code to reduce its size, removing unnecessary spacing, and optimizing the CSS code; thus improving load times. When Javascript and CSS are compressed all comments are usually removed, as well as unneeded "white space" characters like space, new line, and tab. Additionally code can be further formatted onto a single line instead of multiple.

In the case of CSS, this improves load time performance because the size of the file downloaded is often significantly, significantly reduced. Two popular tools for minifying CSScode are CSS Compressor and Google Minify. Many tools also minify/compress Javascript, learn more at What Does Minify JS Mean.





Source Reference: http://www.minifycss.com/