What is the use of comment tag?

Answer 1

They are used to explain parts of code for other programmers or for the one who is writing it. They are ignored by the computer.
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Answer 2

comments help those who want to understand some parts of code. i think its not necessary but if you do it code will be better for understand

Answer 3

After you can write long code. U disturb to know the you can use comment tah easy to understand it.