Final answer:
Comments are used in coding to annotate and improve the readability of a program, helping both the original author and other developers to understand the code more easily.
Step-by-step explanation:
Comments are used to document a program and improve its readability. When learning to code, understanding that comments are supplementary text in your code that the computer ignores during execution is essential. They serve numerous purposes, such as explaining complex sections of code, noting to-dos, or just making code more accessible for other developers or your future self reviewing the code. Comments can be written in various styles, some developers prefer using different colors or numbering systems for various types of notes, akin to how certain students may use different colors or numbers to annotate a text or key ideas.