Why should we differ the concept of raytracing from rasterization?

According to my understanding, modern computer monitors mainly display images in raster ways, that is, what we see on the screen are all dots or pixels. What confused me is that we often said ray tracing is not rasterization, but no matter how the 3D world is calculated, shouldn't everything rendered in the computer be finally converted to pixels forming a raster image on the screen? Or if it is that I misunderstood some critical concepts.