Writing clean code involves creating code that is easy to read, understand, and maintain. This can be achieved by using meaningful variable and function names, keeping functions and classes small and focused on a single task, and following consistent formatting and style guidelines. Clean code also avoids unnecessary complexity by using simple, straightforward logic and structures. Additionally, it's important to write clear comments that explain the "why" behind complex or non-obvious decisions, rather than just describing what the code does. The goal is to make the codebase intuitive and accessible, both for the original developer and for others who may work on it in the future.