How are comments used in programming language?

Answer 1

Comments are completely ignored by the compiler or interpreter. They exist purely to provide little text reminders or remarks that assist us in understanding our own code, making our code easier to read, clarifying the logic, explaining key features, and so on. Comments should be kept as simple and as minimal as possible. If you have to explain every single line of code to yourself then there's something fundamentally wrong with your code. Well-written code should be largely self-documenting, requiring little or no commentary, however, a comment that explains why a section of code exists does far more than a comment that reminds you what it does. The code itself tells you what it does, but why it's doing it may not be quite so self-evident.