The document outlines the composition of an Odoo 15 module, detailing its components such as controllers, data, documentation, translations, reports, security, static files, unit tests, views, and wizards. It emphasizes the important files like '__init__.py' and '__manifest__.py', explaining their roles in importing necessary files and defining module attributes. Additionally, it describes various directories and their purposes within a module, including elements for reports, security settings, and user interface components.