A CDN (Content Delivery Network) is a group of servers distributed in different geographic locations around the world to enable fast delivery of website content. It is also known as a content delivery network.
When a user clicks on an address to request content, the CDN kicks into action: it finds a geographically closest server to display the required data.
With a much higher transfer rate, the usability of the website is guaranteed. By recognizing that the page is friendlier the search engine improves its ranking.
The speed of a website is involved in the traffic optimization process and is closely related to the quality and physical location of the server. The more distant the server is, the more this condition is compromised.
The types of content that a CDN can host range from web objects to real-time media, applications, download elements, or other Internet distribution factors (such as DNS).