Impedance matching is a non-linear process in electronics engineering, where the impedance of a circuit is modified in order to increase the efficiency of the power transmission.
While it might seem counter-intuitive, modifying the impedance in a circuit can increase the efficiency of power transmission.
This process becomes necessary when capacitance and inductance reactive components are present, in which case it is necessary to use the complex conjugate for impedance matching to be effective, which is a complicated process.
You often see smith charts in college textbooks, but since almost nobody uses those anymore they and they aren’t that useful anymore, so it’s not surprising that Ralph Gable’s video explaining how to actually read a Smith chart has been one of the most popular ECE videos on YouTube.
Impedance matching is a complex process, but Ralph’s video provides an excellent, approachable introduction.