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At its core, Jetpack Compose is a composition-based framework. This means that you build your UI by composing small, reusable functions that describe the UI. These functions are called . When you call a composable function, it returns a composition that describes the UI.

During the measure phase, the framework measures the size of each composable and determines its position on the screen. During the layout phase, the framework lays out the composables according to their measured sizes and positions.

The layout system in Jetpack Compose is responsible for measuring and laying out the UI. It's based on a and layout phase.

When the state of the composition changes, the recomposer schedules a . During recomposition, the framework re-executes the composable functions to produce a new composition. The recomposer then updates the UI to reflect the changes.

When the state changes, the recomposer is notified and schedules a recomposition.

The is a critical component of Jetpack Compose. It's responsible for managing the composition and updating the UI when the state changes. The recomposer is a coroutine-based system that constantly monitors the composition for changes.