Code maintainability refers to how easily software can be modified, updated, or fixed over time. It involves writing clear, organized, and well-documented code, making it simpler for developers to understand and work with. High maintainability reduces the time and effort needed for future changes, which is crucial for long-term project success. Factors that contribute to code maintainability include consistent naming conventions, modular design, and comprehensive testing. By following best practices, developers can ensure that their code remains adaptable and resilient to changes in requirements or technology, ultimately leading to more efficient software development processes.