A:AnswerThe "C" wire is the typical power wire in your house wiring to the thermostat. If there is no wire to the C terminal on your old thermostat, there is alternate wiring directions.
A:Answerit does connect straight to Wifi, just need a smartphone, like everything else, to pair it to your wifi. There are official Honeywell apps in iTunes and Andorid stores to control it from a smart phone, but it CAN connect through Alexa as well.