What is the role of comments in JavaScript?

Comments in JavaScript serve the important function of explaining the code and enhancing understanding for both the original developer and anyone else who may read the code later. When developers write comments, they can describe the purpose and logic of the code, clarify complex sections, and document the intention behind decisions made in the code. This is crucial for maintaining code, especially in collaborative environments, as it promotes better readability and reduces ambiguity.

When looking at the other options, they do not accurately reflect the role of comments. While executing scripts and defining variables are essential coding actions, they are not accomplished through comments. Comments are non-executable lines in the code, meaning they do not affect how the code runs. Similarly, outputting data to the console is a functional operation performed via specific commands in the language, rather than through comments. Therefore, the correct understanding of comments' role underscores their value in maintaining clarity and improving the development process.