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I can't tell if you are serious, but assuming you are: this is a ROUTER system. The router takes the information that you get from your internet service provider (the ISP is who you pay a monthly bill to), and ROUTS it wirelessly to all your devices. This Eero is a whole hole system, meaning that you hook one up to the modem (the modem is essentially what translates the internet from your ISP into usable signal), and you plug the other two into a wall. The system then creates a mesh network, giving you full signal throughout the entire home without all the issues you would get if you used a single router or ESPECIALLY if you tried to used the ISP-provided router (because no internet service provider will give you a good enough router. It saves them money to give you a terrible router.)
I am not sure why Jackson answered saying it is a router, the TV commercial goes out of its way to state it IS NOT A ROUTER.
Yes I does it need internet