What are the three types of rendering?

Could you please clarify for me the three types of rendering? I've been reading up on computer graphics and it seems like a fundamental concept, but I'm having a bit of trouble grasping the nuances. Is it something related to the way images are processed and displayed on a screen? Or does it have a broader application in the field of graphics rendering? I'm particularly interested in understanding the differences between the types and how they might affect the final visual output. Could you break it down for me in a way that's easy to understand?