Clean Code is a book written by Robert C. Martin, also known as Uncle Bob, that focuses on writing maintainable and readable code. The book provides guidelines and principles for writing code that is easy to understand, modify, and extend. Here’s a summary of some key concepts:

1. Meaningful Names: Choose descriptive and meaningful names for variables, functions, classes, and modules. Names should reveal the purpose and functionality of the code.

2. Functions: Keep functions small, ideally doing one thing. Functions should have a clear purpose and avoid side effects. Use meaningful names for functions that reflect their actions.

3. Comments: Aim to write self-explanatory code without the need for excessive comments. When you do use comments, make sure they add value by explaining why something is done, not just what is done.

4. Formatting: Consistent and well-formatted code improves readability. Use consistent indentation, spacing, and formatting throughout your codebase.

5. Single Responsibility Principle (SRP): Each module, class, or function should have a single responsibility. If a module or class has too many responsibilities, it becomes harder to maintain and understand.

6. Don’t Repeat Yourself (DRY): Avoid duplicating code by creating reusable functions, classes, or modules. Duplication leads to maintenance challenges and increases the risk of errors.

7. Avoid Magic Numbers and Strings: Replace arbitrary numbers and strings with named constants or variables. This improves code understanding and makes it easier to update values later.

8. Error Handling: Use exceptions for handling errors and exceptional cases, rather than relying on error codes or special return values. This makes the code cleaner and easier to follow.

9. Testing: Write unit tests to ensure the correctness of your code. Tests provide documentation and help maintain code quality over time.

10. Dependency Management: Limit the dependencies between different modules or components. Use dependency injection to decouple components and make them more testable.

11. Open/Closed Principle: Design modules that are open for extension but closed for modification. This encourages you to add new functionality without altering existing code.

12. Continuous Refactoring: Regularly improve the code by refactoring it. Refactoring is the process of restructuring code to make it cleaner while preserving its behavior.

13. Code Smells: Recognize and address “code smells” – indicators of potential problems in your codebase. Common code smells include long functions, large classes, and excessive use of comments.

14. SOLID Principles: These principles (Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion) guide the design of clean and maintainable software architecture.