Declarative Gradle is an experimental project targeting better Gradle developer experience, especially for newcomer users.
The goal is to deliver an elegant and extensible declarative build language that allows developers to describe any software clearly and understandably. The Gradle Team drives this project and collaborates closely with Google and JetBrains, which also runs an experimental project called Amper.
See this blog post by Piotr Jagielski to learn more about the project and its goals.