What are the difference between Bootstrap CSS and Bootstrap min CSS?
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They are both the same code, but the .min.css (Minimized version) file has all unnecessary characters removed in order to make the file size smaller.
Characters like spaces, tabs, comments, new line, gets removed, and long variable names become smaller.
.min.css file is minimized version of the original .css file, hence you should use it in your production server, so that your page loads faster, google tracks the page load time too.