CSS minification is the process of reducing the size of CSS files by removing all the unnecessary characters. This includes whitespace, comments, and optional CSS properties. CSS minification can be done manually or using a CSS minifier tool. Minifying CSS files can help to improve the performance of a website by reducing the amount of time it takes to download and parse the CSS. In addition, CSS minification can also help reduce the size of a page's HTML code, further improving loading times. Although CSS minification can be beneficial, it is essential to note that it can make CSS code difficult to read and maintain. As such, it is vital only to minify CSS files that will not likely be edited in the future.