A content delivery network (CDN) is a distributed network of proxy servers deployed in multiple data centers around the world. Using a CDN service to serve static content will make your website/blog faster. Also it will give a better user experience to your users. With a CDN you can serve text, graphics, scripts, media files, documents, etc. There are several providers out there, but one that I particularly liked because its easy to use, configure and free, is called CloudFlare.
I've configure this blog to use CloudFlare and it is pretty simple. In the video bellow you can see the main feature that you can use if you subscribe for a free plan.