ember-tag-input is an Ember.js addon that provides a reusable component for entering, displaying, and managing tag-like strings or objects. It lets users create tags by typing and pressing comma, space, or enter, and remove them via backspace or a clickable “x”, while delegating all data changes to the host app through `addTag` and `removeTagAtIndex` actions. The addon is aimed at Ember developers who need a lightweight, customizable UI for tag input fields in forms or interfaces.