Maven is a software project management and build automation tool that simplifies managing dependencies and the lifecycle of Java projects, particularly in test automation with Selenium. It utilizes a Project Object Model (POM) to automate the downloading and updating of project dependencies, reducing manual interventions and streamlining processes like compilation, testing, packaging, and deployment. The tutorial details installing Maven through Eclipse IDE and the command line, creating Maven projects, and integrating Selenium along with necessary dependencies like TestNG and Apache POI. Key Maven lifecycle phases, such as clean, install, and test, are highlighted for their roles in project builds, with the Maven Surefire Plugin assisting in executing unit tests. The guide emphasizes Maven's efficiency in automating tasks, enhancing reusability, and managing dependencies, making it invaluable for large-scale projects.