**What are IntelliJ, Gradle, and Maven build systems?**
- **IntelliJ IDEA:** A powerful IDE (Integrated Development Environment) for Java and other languages, offering code completion, debugging, version control integration, and tools for building and deploying applications.
- **Gradle:** A modern build automation tool known for its flexibility, efficiency, and support for both Java and Kotlin DSLs. It excels in managing dependencies, compiling code, and automating the build process with advanced configurations.
- **Maven:** A popular build automation and dependency management tool for Java projects, focusing on a declarative XML-based configuration. It uses a convention-over-configuration approach to simplify project setup and dependency management.