The RaspberryPi is really cool. This is a cool single-Board miniature computer. With access to the Internet.
And the main function of a computer is to calculate, process data, and generate reports, and the Raspberry Pi does a great job with this. However, if you need to control the drive or measure the voltage, then RaspberryPi does not have such functions. And we are starting to attach additional boards to RaspberryPi. Just to expand the capabilities, you need a Fork and it is VERY easy to connect it to RaspberryPi via the HTTP and TCP/IP Socket based API.
If you explain it simply: RaspberryPi - head, Fork - arms/legs, torso.