The Autocomplete Deluxe module defines a custom widget for the Term reference field. For example, the Tags field on the Article content type is a Term reference field.
Drupal ships with its own auto-complete widget but it is pretty basic. Autocomplete Deluxe offers a more enhanced auto-complete experience and best of all it uses the jQuery UI Autocomplete plugin that ships with Drupal. This means you don’t have to download any 3rd party jQuery plugins or other Drupal modules.
In this video, we’ll change the Tags widget on the Article content type to use Autocomplete Deluxe.
drush dl autocomplete_deluxe-7.x-2.x-dev