Clean code refers to programming practices that prioritize readability, maintainability, and simplicity. It emphasizes writing code that is easy to understand for both the original author and other developers. This includes using meaningful names for variables and functions, organizing code logically, and avoiding unnecessary complexity. Additionally, clean code encourages consistent formatting and style, making it easier to spot errors and collaborate with others. By following principles such as DRY (Don't Repeat Yourself) and KISS (Keep It Simple, Stupid), developers can create software that is not only functional but also adaptable to future changes and enhancements.