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Caching servers are an integral part of a Content Distribution Network (CDN) primarily because they are designed to reduce server load. By storing copies of frequently accessed content, such as web pages, images, and videos, caching servers allow users to retrieve data from locations closer to them, rather than always having to access the origin server. This localized access means that the origin server experiences less traffic, significantly alleviating the load on its resources.

When a user requests content, if it is available in the cache, the response time is improved, leading to a better user experience. This not only helps to minimize latency but also enables more efficient bandwidth usage. As more users access the CDN, the number of requests sent to the original server diminishes, which can also lead to lower operational costs for the server infrastructure. Thus, the primary function of caching servers is to enhance performance and reliability by reducing the demand on the central server while delivering content quickly and efficiently to end-users.