TL;DR
A content delivery network (CDN) is a geographically distributed network of edge servers that cache and serve a site's static assets, and sometimes its HTML, from the location closest to each visitor.
What is Content Delivery Network (CDN)?
A content delivery network (CDN) is a geographically distributed network of edge servers that cache and serve a site's static assets, and sometimes its HTML, from the location closest to each visitor.
Learn more in our choosing the fastest CDN guide, or work with us through our done-for-you speed optimization service.
How CDN is Measured
CDN usage is observable in response headers (such as cf-ray or x-cache) and in CDN provider analytics.