Significance of ‘XXX.min.js’ file in WordPress plugin

  javascript, plugins, wordpress

I was debugging the ‘woo-variation-gallery’ plugin for WordPress.
I found that under ‘asset->js’ folder, for every XXX.js file there is a XXX.min.js file present.
For example :

1. admin.js ---- admin.min.js
2. frontend.js ----- frontend.min.js
3. so on....

I would like to understand the significance of xxx.min.js file ?
What’s the purpose of these *.min.js files ? Why corresponding to every .js file in the folder, there is a .min.js file present ?

Thanks.

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