Digital chip implementation relies on routing to transform logical connectivity into manufacturable physical interconnects. Standard cells, macros, and I/O pins must be connected through specific metal layers while preserving the intent of the schematic and logical netlist. Routing quality affects not only connectivity completion, but also timing, congestion, noise behavior, signal integrity, and final layout robustness. Poor routing can create long detours, excessive resistance and capacitance, crosstalk risk, design-rule violations, and difficult timing closure. Signal integrity analysis examines how routed interconnects behave electrically in a dense digital layout. Real wires have parasitic resistance, capacitance, and coupling to nearby wires. These effects can change signal delay, degrade slew, create noise bumps, and cause timing shifts. Signal integrity becomes especially important when routing density is high, nets run in parallel for long distances, or critical signals pass through crowded regions. Accurate analysis depends on proper inputs such as routed layout data, parasitic extraction, switching information, timing constraints, and technology rules. Routing is handl...