What's the difference between high-speed photography and slow-motion camera?

We usually shoot videos or movies at 24 frames per second, and more than 24 frames are high-speed photography; We also play videos or movies in 24 frames. If we slow down less than 24 frames, the camera will slow down. For example, we saw a video in which a bullet penetrated an apple lens, which was done by high-speed photography and slowing down the camera.