How is the connecting rod and piston connected?

The connecting rod is connected to the piston using a piston pin. The connecting rod usually has a bronze bushing into which the pin is inserted with a certain gap. The piston has a hole on both sides. Thus, the finger is inserted into the piston with a predetermined interference, while simultaneously connecting it to the connecting rod. It all depends on the type, power and size of the piston group. Sometimes you have to heat the piston so that you can insert the piston pin into its seat. All this is done on special presses, and if the dimensions are small, then you can manually.