Introduced with Android 5.1 Lollipop, FRP is a security feature designed to prevent a thief from using a stolen phone after a factory reset. Once FRP is activated (when a Google account is added to the device), after a factory reset via recovery mode, the phone will ask for the before allowing setup to continue.
The author and website do not promote illegal bypassing of FRP on stolen devices. Use responsibly and only on devices you own or have explicit permission to service. gsm one info o androidfrp