Ember‑CPM is an Ember.js addon that provides a library of composable computed‑property macros (e.g., `sum`, `difference`, `ifNull`, `htmlEscape`, etc.) allowing developers to build complex computed properties by nesting macros instead of writing boilerplate code. It’s aimed at Ember application developers who want a cleaner, reusable way to define and combine computed logic in their components, services, and models.