Before understanding how a CDN service improves the page load time of your website, let us first understand how the underlining technology works.
Content Delivery Networks (CDN) serves the content of a site to a user based on their geographic location. A CDN shortens the path information has to travel between the server and user. A CDN is a network of servers in multiple locations. When a user accesses a website, information is pulled from the server location nearest to him.
The result is a faster flow of data.
If a user from India visits your site, this browser could download files from a nearby geographical server. So it increases the speed of a website & lowers the latency.
CDNs are designed to reduce a website's latency. Latency is nothing but the time taken from the user's request to view your site, from the Host server to the content actually appearing on the user's browser.
The physical distance between the user's location and the location of the site's hosting server has effect on the latency.
The aim of a CDN is to shorten the physical distance, virtually thus improving the site's speed and performance.
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