Raspberry Pi Pico: new version with built-in Wi-Fi - Andrew Cunningham - arstechnica
https://arstechnica.com/gadgets/2022/06/the-tiniest-raspberry-pi-gets-a-new-version-with-built-in-wi-fi/snippet:
the Raspberry Pi Pico launched in January of 2021 for just $4, the Pico's RP2040 microcontroller incorporates a pair of 133MHz Arm Cortex-M0+ CPU cores and 264 kilobytes (not megabytes) of memory. The low specs and low price make it well-suited for single-purpose devices that don't need much processing power instead of running general-purpose software like the larger Pi boards.
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the Raspberry Pi Pico W, adds built-in Wi-Fi connectivity to the board while increasing the price from $4 to $6.