What is the difference between bootstrap.min.css and bootstrap.css?

Question

What should I use between bootstrap.min.css or bootstrap.css?

I am confused between the two files because bootstrap.css is readable i.e

Answer 1

bootstrap.min.css has been minified. This means all the whitespace and other extra characters have been removed. This is commonly done for use in production, to reduce the size of the file. When developing, it is usually helpful to use the unminified version, since, as you said, it is readable.

EDIT: As mentioned by DrBeza in a comment, if your intention is to modify the bootstrap.css file, it is much better practice to create a separate .css file and add your own css rules that override the defaults. This way, if you update to a newer version of bootstrap, you can simply swap out the bootstrap files, instead of needing to edit the new bootstrap.css to move your modifications over to it.