What is files.wordpress.com?

CDN / front-end caching: all scripts and stylesheets are served from our CDN. Images are served from our dedicated *.files.wordpress.com domain.

https://vip.wordpress.com/documentation/caching/

That page should answer your question regarding the WordPress.com CDN. cybmeta correctly stated that it is for VIP WordPress members only.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)