Design rules play a critical role in maintaining signal integrity within modern circuit layouts, especially as board density and operating speeds continue to increase. Clear spacing, controlled impedance, proper grounding, and well-defined routing paths help reduce noise, crosstalk, and signal loss. During the layout phase, designers rely on structured rule checks to ensure consistency and electrical reliability across the board. In the middle of this workflow, tools such as OrCAD PCB designer support systematic rule validation and layout discipline without disrupting design flow. By applying these principles early, engineers can minimize rework, improve performance, and achieve stable, high-quality designs suitable for complex electronic applications.