An electric poker vibrator is a construction tool with a flexible shaft and a vibrating "poker" head, powered by an electric motor, used to compact freshly poured concrete, remove trapped air bubbles, and achieve uniform density for stronger, smoother structures. It works by inserting the vibrating head into the wet concrete, creating high-frequency oscillations that momentarily liquefy the mix, allowing aggregates to settle and air to escape, enhancing the concrete's quality.