What does Data Transfer Saved mean?

I got an email saying that on my sites in January I had 2.8% data saved. Saved for who? Saved how? Is it something I should care about?

https://www.cloudflare.com/learning/cdn/what-is-a-cdn/

Cloudflare served some of your site’s assets from a cache instead of pulling the data from your site, saving your server bandwidth (which some hosts charge you for). This should generally be close to the “percent cached” metric in your site’s dashboard on https://dash.cloudflare.com:

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