Jetpack Compose is a toolkit for building native Android UI. It allows developers to build user interfaces for Android apps using Kotlin code, following a reactive programming model. In a reactive programming model, the UI is automatically updated whenever the underlying data changes, which makes it easier to build dynamic and responsive UI.

Jetpack Compose provides a powerful set of UI elements and animation APIs, making it easy to build beautiful and responsive UI. It is designed to be fully interoperable with the existing Android View system, so developers can use Compose alongside their existing UI code, or gradually migrate their app to use Compose for all of its UI.

The main aim of Jetpack Compose is to accelerate development by letting you as a developer write UI with much less code. In other words its faster and easier enabling you as a developer to focus on creating features and spend less time creating UI.

Overall, Jetpack Compose is a modern, efficient, and flexible toolkit for building native Android UI.