Remembering code can be a challenging task, especially when returning to it after a long period of time. It becomes difficult to comprehend the purpose and functionality of the code. This is where comments play a crucial role in aiding our understanding of the code. Comments serve as helpful reminders or explanations about the logic behind the code, allowing us to quickly grasp its intent even after a significant gap in time.

In Solidity, there are various methods of incorporating comments into the code. These comments serve as informative annotations that assist in clarifying the code’s purpose, making it easier to revisit and comprehend. By adding comments at relevant points in the code, we can provide insights into the logic, highlight important sections, or explain complex algorithms or data structures. These comments act as helpful signposts, enabling us to catch up on the code’s functionality quickly, even after an extended absence.

There are two types of comments commonly used in programming: single-line comments and multi-line comments.

1. Single-line comment: A single-line comment is used to provide a brief description or explanation of a code segment within a single line. It is denoted by two forward slashes “//” followed by the comment text. Single-line comments are often used for short and concise comments.
   For example:

2. Multi-line comment: A multi-line comment is used for longer explanations or for commenting out multiple lines of code. It allows you to comment on multiple lines without using the single-line comment syntax repeatedly. In most programming languages, multi-line comments are enclosed between a start symbol and an end symbol.
   For example, in languages like C, C++, Java, and JavaScript, multi-line comments are represented as follows:

In addition to single-line and multi-line comments, there is another type of comment called NatSpec comments, which is often specified in programming style guides. NatSpec comments provide detailed documentation and are typically used directly above function declarations or statements.

NatSpec comments can be written using either a triple slash ( /// ) or a double asterisk block ( /** … */ ). These comments serve as a form of documentation and provide essential information about the purpose, behavior, and usage of the associated code.

For example, in Solidity languages NatSpec (see NatSpec in detail) comments are commonly used to document functions:

Triple-slash format:

Double asterisk block format:

NatSpec comments enhance the readability and maintainability of code, making it easier for other developers to understand and utilize the associated functions or statements. It is important to follow the guidelines of the specific programming language and style guide being used to ensure consistent and effective documentation.