The ESP32 and ESP8266 microcontroller series are built by the chinese company Espressif. The ESP32 microcontroller family consists of many flavors, i.e. microcontrollers (MC) of different generation with varying core types, number of cores, and capabilities.

These MCs are usually provided as modules, assembled small scale module PCBs (printed circuit boards) to be soldered on larger application specific PCBs with additional periferals such as USB interface, power supply, LEDs, etc.

The general hardware reference page is the main entry point for the complete hardware related documentation for all MCs and modules produced be Espressif.

• ESP32-S3-DevKitC-1 V1.1 by Espressif
• ESP32 modules other than ESP32-S3-DevKitC

Wolles Elektronikiste (de): Excellent technical overview in German.