Thereare Digital Pins and Analog Pins depending on the signal. We will learn how to use the inputs and outputs. There are essentially two types of pins, analog and digital pins. Digital pins can be set to either HIGH (usually 5V or 3.3V) or LOW (0V). You can use that to e.g. read a button state or toggle an LED.
Inthe ESP32 pinout, if you count the pins on an ESP-WROOM-32 bar module, you will see that it has a total of 38 pins. Among these pins, including power, GND, reset, NC pins, etc., only 33 are GPIO pins. However, out of these 33 GPIO pins, only 27 are usable GPIO pins. Not all GPIO pins will be accessible in all ESP32 development
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7 pin vs 13 pin
