Module development in Drupal is a powerful process that allows for flexible and customized functionality expansion of a website. Following a modular architecture, Drupal enables developers to create modules that add specific features without altering the core code of the system. This begins with defining hooks, which facilitate interaction with the core of Drupal and other modules, making it easier to integrate new functionalities. Developers can also leverage robust APIs to manage data, users, and permissions while adhering to best security practices. The creation of a module can also include custom user interface elements, forms, and routes, ensuring a smooth and intuitive user experience. With the vast Drupal community and the wealth of available documentation, developers can quickly find resources and examples to guide them through the development process, making module creation not only accessible but also rewarding.