Contributed modules are add-ons for Drupal, allowing you to extend, build, and customize Drupal’s core functionality. These modules are not part of the core files and may not have optimized code/functionality for your purposes. If there isn’t a module to solve your needs, you can create one for the rest of the community to use, or consider joining forces and helping the maintainer. You can also view a full index of modules listing only their titles. See the handbook page for help on installing modules.