Modular programming is a software design technique that breaks a program into smaller, manageable sections called modules. Each module focuses on a specific task or functionality, making it easier to develop, test, and maintain the code. This approach allows programmers to work on different modules simultaneously, improving collaboration and efficiency. By using modular programming, developers can reuse existing modules in different projects, saving time and effort. It also enhances code readability, as each module can be understood independently. Overall, modular programming promotes better organization and flexibility in software development, leading to higher quality applications.