Kilovolt‑ampere reactive (kVAR) is the standard unit used to quantify reactive power in alternating‑current (AC) electrical systems, and its symbol is kVAR. Unlike real power (kW), which performs useful work, kVAR measures the energy that oscillates between the source and reactive components such as inductors and capacitors, supporting voltage regulation and maintaining system stability. Engineers and technicians use kVAR ratings to size capacitors, design power factor correction schemes, and assess the efficiency of industrial, commercial, and utility networks, making it essential for optimizing energy consumption, reducing losses, and complying with grid codes. In both practical applications—like sizing HVAC equipment or large motor drives—and scientific analyses of power quality, understanding kilovolt‑ampere reactive is crucial for achieving reliable, cost‑effective, and sustainable electrical performance.