Whether Cloudflare is a CDN or not

Hi,

Originally I think Cloudflare is a CDN, see this https://www.cloudflare.com/cdn/. But in this article Using WP Rocket with Cloudflare - WP Rocket Knowledge Base, it said Cloudflare ≠ CDN.

THen I see this article The Ideal WP Rocket Settings For 2021 (got me 1s load times), it said Cloudflare needs me to change the name servers to those in Cloudflare. It seems that Cloudflare will be webhosting for my website? Currently our website is hosted in a dedicated server. If using Cloudflare, does that means we need to replace the dedicated server with Cloudflare?

Totally confused.

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