A CDN keeps a copy of your site in data centres around the world, so a visitor in Sydney is served from Sydney instead of waiting for Europe. What you have to do about it depends on which product the site is on.
Footprint-free sites: it is already on
Nothing to switch on and nothing to buy — the CDN is part of what that product is, and it is included. There is no provider name shown on the card, and that is deliberate rather than an omission: which edge account fronts which site is exactly the fact that product exists to keep private.
Mainstream hosting: off by default, and you choose
Open the site, then the CDN tab. Three options:
You can also decide when you create the site: under CDN provider, choose No CDN (our nameservers only) and the site starts with the CDN off. Our nameservers still answer for your domain, so DNS works exactly as it does for any other site.
What the allowance means, and why Africa costs more
A managed plan comes with a traffic allowance in gigabytes. A gigabyte is not the same price everywhere — serving one to Africa or South America costs several times one served to Frankfurt — so the allowance is counted in base-region-equivalent gigabytes and traffic in dearer regions spends it faster.
That sounds like small print but it is the honest version: it means the number on your plan is the true worst case whatever mix of countries your visitors come from, rather than a headline figure that quietly does not apply to your audience.
Set a budget before you need one
The CDN tab has a budget. Set it. Traffic is the one cost on the platform that somebody else can move — a link that goes unexpectedly well is indistinguishable from a scraper — and a budget turns a surprise into an email.
Changing your mind
Switching tiers does not move your site or change its content; it changes where visitors are served from. Turning the CDN off leaves the site running from its origin.