CSS minifier is a software tool that decreases Cascading Style Sheets (CSS) file size by removing unnecessary characters, such as whitespace, comments, and redundant code. This is done without affecting CSS functionality. It aims to improve website performance by reducing CSS download and parsing time. By optimizing CSS code, a minifier minimizes bandwidth usage and improves web page loading speed.
It must have been so hard to write this without being able to post a link! 