
Drupal modules can be defined as a collective set of functions that can be used to create certain features. There are two sets of Drupal modules - 'Contributed modules' and 'custom modules'. Contributed modules are modules that are contributed by Drupal users for general use whereas modules which we create to achieve certain functions are called 'custom' modules. If you want to know how to create a module on your own in Drupal 7, you may read on.