All of the above.
Programmers write comments throughout their code for several reasons:
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To make the code more readable to themselves and others: Comments can clarify what the code does, which helps anyone reading the code (including the original author) understand it better and more quickly.
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To explain the logic of certain coding decisions: Comments can provide context about why particular decisions were made, which can be especially useful when the reasoning might not be immediately clear from the code itself.
Overall, comments are a crucial part of writing maintainable and understandable code.