# Overview **vCDN** (**GreenNode Content Delivery Network**) is a content delivery network developed by **GreenNode**. With strategically positioned servers at various locations and equipped with high bandwidth, vCDN helps accelerate the speed of websites and mobile applications. This enhances user experience and increases customer satisfaction. **Why use vCDN?** * **Protect Website from DDoS Attacks:** vCDN uses a distributed architecture to protect the website from DDoS attacks and minimize damage from attacks. * **Improve Google Ranking and SEO:** vCDN improves Google Ranking and SEO by optimizing access speed and enhancing website performance. * **Optimize Bandwidth and Costs:** vCDN reduces the load on the origin server and optimizes bandwidth usage, helping save operating costs. * **Increase Concurrent Users:** vCDN supports serving a large number of concurrent users at multiple locations, enhancing service capacity and user experience. * **High Availability, Easy Deployment:** vCDN ensures high availability and reliability, keeping the website running smoothly and stably. Additionally, vCDN is easy to integrate and deploy quickly. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.vngcloud.vn/vng-cloud-document/vcdn/tong-quan.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.