When designing a PCB for high-frequency signals, what is the primary purpose of placing decoupling capacitors as close as possible to the IC's power pins?

The primary purpose of placing decoupling capacitors as close as possible to an integrated circuit power pin is to minimize the parasitic inductance of the PCB traces connecting them. Every conductor has a property called parasitic inductance, which acts like a physical barrier that resists rapid changes in electrical current. When a high-frequency chip switches its internal transistors, it demands a sudden surge of current. If the capacitor is f....