The Arduino's Secret WIFI

The Arduino can actually transmit data without any module connected to it. Is there a secret built-in WIFI? (Ok, receiving is not THAT easy).
This video was kindly sponsored by PCBWay: https://www.pcbway.com/?from=Doctor%2...

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00:00 - Intro
00:42 - Amplitude Shift keying (ASK=
00:57 - Carrier frequency generation
01:55 - How ASK is done
02:52 - The receiver
04:31 - PCBWay
05:11 - Testing the range
06:34 - Maximum the baud rate