Polaris, the North Star, is a stable navigational marker in the night sky because we always see it in the same position from the northern hemisphere. It's close to the north celestial pole, so it's almost straight overhead when viewed from the North Pole. The rest of the night sky appears to rotate around the North Star due to the earth's rotation. Polaris is one of the brightest stars in the night sky to it's easy to locate.
While Polaris is currently the North Pole star, it hasn't always been. The earth's axis of rotation slowly changes over time. The apparent position of the North Star is slowly moving away from the north celestial pole as the earth's precessing axis sweeps out a circle in the sky, but it will come back around to that position. The period of precession is about 26,000 years so it will take 13,000 years for Polaris to reach its maximum distance from the north celestial pole.