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In JavaScript, comments are used to add explanations or remarks to the code, which are ignored by the JavaScript engine. There are two types of comments in JavaScript: single-line comments and multi-line comments. A single-line comment starts with two slashes '//' and any text between the slashes and the end of the line is considered a comment. Multi-line comments start with '/*' and end with '*/', and any text between these delimiters is considered a comment. This allows developers to add detailed explanations or temporary disable parts of their code during development. Microsoft Visual Studio and other Integrated Development Environments (IDEs) support these commenting conventions in JavaScript.

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