One of the great strengths of Drupal is the wide selection of available modules, providing everything from the integration of external media to complex access restrictions, with many modules expanding standard functionality to fit specific use cases.

Combining existing modules can cover most of your needs, but every project is different and has unique details that are not covered by any module. This where glue code comes in—project-specific code that fills the gap between the functionality provided by existing modules and the exact requirements of your project. Glue code allows you to bring projects to 100% completion with full customer satisfaction.