Which term is a comparison between two things made to clarify or explain?

The term that serves as a comparison between two things to clarify or explain is analogy. An analogy draws parallels between two different concepts or ideas to illustrate a point or improve understanding. For example, saying that "life is like a box of chocolates; you never know what you're going to get" uses the concept of a box of chocolates to explain the unpredictability of life, helping to clarify the intended message.

Metaphor, while also a comparison, is more about suggesting that one thing is another to highlight a particular quality or characteristic without using "like" or "as." Contrast, on the other hand, highlights differences between two things and does not serve the purpose of clarification or explanation. Parody involves imitating a style or work to create a humorous effect, rather than making a clarifying comparison. Hence, analogy is the most fitting term for this type of comparison.