CloudFlare is a service that helps improve website performance by routing traffic through its network, which is distributed globally. This enables faster delivery of content to visitors as resources are cached at CloudFlare's nodes and served from the closest node to the visitor. The core service is free and accessible to any website with a domain name. Dynamic websites can also benefit from CloudFlare's intelligent caching system, which ensures that dynamic content remains fresh while larger images, CSS, and JavaScript are cached for faster delivery.