Your WiFi signal originates from where the WiFi connection is established in your home— the wireless router. For signal, wireless routers use a certain frequency band, either the 2.4 GHz band or the 5 GHz band.
Where does Wi-Fi Internet come from?
Wi-Fi is the radio signal sent from a wireless router to a nearby device, which translates the signal into data you can see and use. The device transmits a radio signal back to the router, which connects to the internet by wire or cable.
Does Wi-Fi come from satellites?
For those of you that might be reading this that also don't know the answer, no - Wi-Fi doesn't come from satellites. Wi-Fi is a wireless technology developed for Local Area Networks, and uses standards defined by the IEEE, in this case a bunch of standards under the exotically titled 802.11 banner.