What is controlled impedance?

FAQ about printed circuit boardsTERMINOLOGY

Consider the PCB signal as it travels along a track controlling impedance means that we control the performance or speed of that signal at a point along a track. Related to resistance, capacitance and conductance of the track in question. The impedance is also measured in Ohms, it is different than resistance which is a DC characteristic. Impedance is an AC characteristic, meaning that it is related to frequency.