Maven is a tool for managing Java-based software projects that provides a standard way to manage builds, documentation, dependencies, and project metadata. It simplifies common project tasks like compiling code, generating reports, and managing dependencies. Maven uses a Project Object Model (POM) file to store build settings and dependencies for a project. It maintains a central repository of dependencies to avoid duplicate copies of files. Maven builds can be configured to compile code, test it, package artifacts, and generate reports through a standardized process. Maven archetypes provide project templates to quickly generate new projects with common configurations.