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It adopts a declarative approach, enabling developers to build UI components using Kotlin code instead of XML. Compose leverages the power of Kotlin's language features and functional programming, making UI development faster, more intuitive, and less error-prone.

Compose allows you to do more with less code, compared to using the Android View system: Buttons, lists or animation - whatever you need to build, now there's less code to write.

There are many benchmarks that compare the performance and rendering speed of XML and compose. For the most part, they all show that compose is faster.

In Compose, you use composable functions to emit portions of your UI, but layouts are the ones that specify the precise arrangement and alignment of those elements. Therefore, layouts, whether you use the ones Compose provides for free or build your own custom ones, are a vital part of the Compose world.

In conclusion, the introduction of compose doesn't mean that the XML is deprecated. Maybe after a few years, Google suggests that compose will be the preferred way of creating easy and reusable UI components. This can minimize a lot of boilerplate codes and improves startup time, application size, and build time.

Compose provides a collection of ready-to-use layouts to help you arrange your UI elements, and makes it easy to define your own, more-specialized layouts.

In Jetpack Compose, state is represented by a mutableStateOf function, which takes an initial value and returns a MutableState object. This object contains the current state of the UI element and can be passed around and modified as needed.