Server and high-defense CDN (Content Delivery Network) are two different technologies and services. They have the following differences in functions and applications:

　　Functions and uses:

　　Server: A server is a computing device used to store, process and provide data and services. It can host websites, applications, databases, etc., providing users with data storage and computing resources. The server is mainly responsible for processing user requests and returning corresponding data.

　　High-defense CDN (Content Delivery Network): High-defense CDN is a distributed network service used to accelerate content transmission and provide security protection. CDN allows users to obtain content from nodes closer to them by storing content on various edge nodes around the world, thereby providing faster response times and a better user experience. At the same time, high-defense CDN can also provide functions to defend against distributed denial-of-service attacks (DDoS) and other network security threats.

　　working principle:

　　Server: The server receives user requests and processes and responds according to the type and content of the request. It can provide dynamic content such as database queries, calculations, and generation of web content. Servers are usually located in data centers or cloud platforms and communicate with users over the Internet.

　　High-defense CDN: High-defense CDN allows users to obtain content from the nearest node by distributing content to edge nodes around the world. When a user requests access to content, the CDN delivers the content to the user from the nearest node, thereby reducing latency and network congestion. High-defense CDN can also provide functions such as caching, compression, load balancing, and security protection as needed.

　　service provided:

　　Server: The server mainly provides computing and storage resources for hosting and running applications, websites, databases, etc. Users can choose the appropriate server configuration based on their needs and have full control over the software and data on the server.

　　High-defense CDN: High-defense CDN mainly provides content transmission and acceleration services, as well as network security protection. It can provide global coverage of content distribution, ensuring users can quickly access content. At the same time, High Defense CDN can also identify and filter malicious traffic through intelligent protection mechanisms to defend against DDoS attacks and other network security threats.

　　In summary, servers and high-defense CDN are different in terms of functions and applications. The server mainly provides computing and storage resources for hosting applications and websites, while the high-defense CDN mainly provides content distribution and acceleration services, and provides network security protection. In some cases, the two services can be used together to provide a better user experience and network security.